必修一13单元_必修一集合单元

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必修一1-3单元 第一单元

1.I like Chinese because I enjoy reading stories and poems.because 和 because of 区别

because conj.是一个从属连词，引导原因状语从句

because of 是一个介词短语，后只能跟名词或名词短语

例如：

I didn’t go there because it was raining the while day.I didn’t go there because of rain.2.What are the main differences between Junior High school and Senior High school?

difference 和 different 区别

difference n.名词 多用句型 make the difference between A and B 分清A与B的区别

different adj.形容词 多用句型 A is different from B 3.The teacher write on the computer , and their words appear on the screen.电脑、电视、收音机等多与介词 on 搭配

on TV , on the Internet , on the radio , on the phone 4.We do this in a fun way, with spelling games and other activities。way n.方法，手段 多与介词 in 搭配 You should do it in another way.5.In other words, there are three times as many girls as boys.（1）in other words 换句话说，那就是说

He came very late.In other words, he came early in the morning.（2）倍数表达

倍数 once, twice , three times + as +adj.+ as + n.This room is twice as large as that one.6.Li Kang is very impreed with the teachers and the technology in his new school.Impre vt.及物动词 使（某人）印象深刻（常用被动语态）

I was deeply impreed with（by, at）his speech.他的演说给我留下深刻印象。

7.Li Kang’s first homework is a description of the street where he lives.Where he lives 是定语从句修饰street，where 在从句作状语 = in which

例如：This is the place where I worked ten years ago.比较：This is the place which I visited last week.（which 在从句作宾语）

8.Is your cla the same size as his?

same adj.前要有冠词，后多与 as 连用

My bike is the same as yours.9.Is the number of boys and girls the same?

The number of 与 a number of 区别

The number of … ……的数目，谓语要用单数，这里number 是一个名词。

A number of … 多数，大量的，修饰可数名词复数，这里number是量词。

The number of the boys in our cla is 25.A number of students like pop songs.10.Are you looking forward to doing your English homework?

to此处是介词，与名词连用，动词需用动名词形式

I am looking forward to reading you new book.Grammar

11.Revision of the present tenses

一般现在时态用于以下几种情况：

（1）表示现在习惯动作。例如：He always sleeps with his windows open.（2）表示客观真理，科学事实，格言及其他不受时间限制的客观存在。

例如：London stands on the River Thames（泰晤士河）。

（3）图片说明或体育运动等的报道，解说。

（4）表将来时间。主要是根据规定或时间表预计要发生的动作或事态。

例如：The term starts on 23rd August.此外也可用于条件或时间状语从句，如：If she comes, we’ll tell her.现在进行时态主要表达

（1）表示说话时正在进行的动作

注意现在进行时与一般现在时的区别：用一般现在时往往带有长久的含义，而用现在进行时则表示暂时的含义。

例如：He lives in Shanghai.He is now living in Shanghai.（2）与always, continually等状语连用带有感情色彩，表示说话人“赞扬、厌烦”等。

She’s always borrowing money and forgetting to pay me back.（3）表示计划安排中近期即将发生的动作。

例如：I’m going to Qingdao for the summer holiday.12.Adjectives ending in v-ing and v-ed

现在分词和过去分词作形容词的用法区别

现在分词在句中作表语表示主语（事、物）所具有特征，意思是“令人如何如何”

例如：amusing, astonishing, disappointing, exciting, frightening, interesting, moving, relaxing, satisfying, shocking, surprising terrifying, tiring, worrying等。

过去分词作表语多表示主语（人）所处的状态，意思是“对什么感到如何”。

例如：amused , astonished , disappointed , excited , frightened , interested , moved , relaxed , satisfied , shocked , surprised , terrified , tired , worried等。

请比较下列例句：

His lecture is interesting.I’m interested in it.他的演讲报告很有趣。我对这个报告感兴趣。

We are surprised to hear the news.我们听到那消息吃了一惊。

The situation is encouraging.形势使人鼓舞。第二单元

1.patient adj.耐心的；能忍受的；n.病人

原文：She is kind and patient ,and she explains English grammar so clearly that even I can understand it!她和蔼，有耐心，而且她讲解的英语语法是如此的清晰，甚至连我也能听得懂！(P12)1)be patient with sb.对某人有耐心

be patient of sth.忍耐某事 2)patience n．耐心；耐性

be out of patience with对……忍无可忍

have no patience with对……不能容忍

with patience＝patiently耐心地

3)impatient adj.不耐烦的；没有耐心的例句：

She is very patient with young children.她对孩子特别有耐心。

A good teacher is always patient of any questions raised by his students.一位好老师总是耐心对待学生提出的任何问题。

After the earthquake，he waited for the rescue with patience/patiently.地震后，他耐心地等待救援的到来。

You need a lot of patience when you work here.你在这里工作需要很大的耐心。

大家可通过下面的口诀来记忆通常直接跟动词ing形式作宾语的词或词组(不能直接接动词不定式)：

避免错过少延期avoid，mi，delay/put off 建议完成多练习suggest/recommend，finish，practise 喜欢想像禁不住enjoy，appreciate，imagine，can’t help 承认否定还考虑admit，deny，consider 逃避冒险不介意escape，risk，mind 期待成功更值得look forward to，succeed in，be worth 另外，常见的还有excuse，resist，give up，can’t stand等。例句：

Fortunately，we were able to avoid an accident.我们幸运地逃过一场事故。He was lucky and avoided punishment / being punished.他很幸运，避免了惩

罚。

I suggest going out for a walk after supper.我建议晚饭后出去散步。考虑建议盼原谅 consider, suggest/advise, look forward to, excuse 承认推迟没得想 admit, delay/put off, fancy 避免错过继续练 avoid, mi, keep/keep on, practice 否认完成就欣赏 deny，finish，enjoy/appreciate 禁拒想像才冒险 forbid, resist，imagine, risk 不禁介意准逃亡 can’t help, mind, allow/permit, escape 4.appreciate vt.感激；欣赏；重视

but most of us really appreciate her because her teaching is so well organized and clear.……，但是，我们多数人都非常赞赏她，因为她讲的课既条理又清晰。(P12)appreciate sb./sth /doing I would appreciate it if...如果……，我将不胜感激。例句：

To tell the truth, I can’t appreciate his works.说实话，我欣赏不了他的作品。

We shall appreciate hearing from you again.我们将乐意再次收到你的来信。I would appreciate it if you can help me close the door.如果你能帮助我把门关上，我将不胜感激。

5.admit vt.承认(错误、罪行等)；容纳，接收；准许进入(或使用)，让…享有(to)原文：And a few students even admit liking her!甚至有些同学承认喜欢她！

(P12)1)admit sth.承认(事实、过失等)

admit doing sth./having done sth.承认做了某事

admit that...承认……

2)admit sb./sth.to be...承认某人/事……

admit sb./sth.to/into接纳某人(某物)进入…，吸收某人(某物)参加；许可…进入

be admitted to...被接收(入学、入院等）例句：

At last the thief admitted his crime.最后小偷承认了他自己的罪行。She apologized to me and admitted having taken my umbrella by mistake.她向我道歉，承认错拿了我的雨伞。

We all admit him to be foolish.我们都认为他是个傻瓜。Luckily for him，he was admitted to Beijing University.幸运的是，他被北京大学所录取。

admit当“容纳”讲时，可替换为hold，contain，seat

例句：They want to build a lecture hall which can admit /hold / contain /seat 10,000 people.他们想建一个可以容纳一万人的报告厅。4）同义词：

acknowledge 通常指公开承认某事的真实情况或自己的过错。admit 强调因外力或良心驱使或经判断而明确承认，多含不情愿或被迫意味。confe 语气较强，着重承认自己意识到的错误或罪行，含坦白忏悔的意味。recognize 作“承认”解时，系书面用词，主要指合法的或外交上的承认，也指公认。concede 指在事实与证据面前勉强或不得不承认。6.respect vt.尊敬；尊重；n.尊敬，尊重；着眼点，方面；敬意，问候(常用复数)原文： I respect him a lot.我很尊敬他。(回归课本P12)1)respect sb./sth.for sth.因某事尊敬或尊重某人/某物

respect oneself自尊；自重

2)show/have respect for对……表示尊重，尊敬

out of one’s respect出于对……的尊敬 3)in respect of关于……，就……而言

in all respects＝in every respect在各方面

4)give/send one’s respects to代某人向……问 候 例句：

If you don’t respect yourself，how can you expect others to respect you？自己不自重，又怎能受到别人尊重呢？

You should respect the ideas of others.你应该尊重别人的意见。Children should show respect for their teachers.孩子们要尊敬老师。I can’t agree with you in this respect.在这方面我不赞同你的观点。My mother sends her respects to you.我母亲向你问好。Your products are attractive in respect of price.就价格而言，贵方产品是具有吸引力的。词组：

1.make sure弄清楚；查明；确信；务必(做到)1)make sure of /about...弄清楚；查明

make sure that...确信；务必

2)be sure of /about / that从句 有把握；确信(主语自信)

be sure to do sth.一定要，务必(去做某事)First you must make sure of the time and place.首先你必须弄清时间和地点。

I think there is a train at 6 o’clock，but you’d better make sure.我想6点钟有一班火车，但你最好查明白。

I must go back home and make sure I closed the windows.我必须回家去看看有没有关上窗户。

Be sure to ring and let us know you’ve got back safely.一定要来个电话，让我们知道你已平安返回。as a result结果

1)as a result of因为；由于

with the result that...因此……，结果……

without result毫无结果 2)result in导致

result from起因；由

He got up late in the morning.As a result，he was late for cla.他早晨起床晚，结果上课迟到了。

He was late as a result of the traffic jam.由于交通阻塞，他迟到了。Sara wasn’t at school last week，with the result that she mied an important test.萨拉上周没上学，结果错过了一次重要考试。His carelene resulted in the terrible accident.＝The terrible accident resulted from his carelene.那桩可怕的事故是由于他的疏忽大意而引起的。a bit稍微，有点儿

例句：The peach is a bit green.桃子有点儿生。

Can you speak a bit slowly？你能说得稍微慢点吗？ 辨析：a bit与a little 1)a bit和a little用在肯定句中修饰形容词或副词时，基本可互换使用。

I feel a bit/a little hungry.我感到有点儿饿。2)修饰名词时，a bit of＋n.＝a little＋n.。

I want to drink a bit of water.＝I want to drink a little water.我想喝点儿水。

3)not a bit 一点也不= not at all=not in the least /not in the slightest

not a little 很，非常

She is not a bit tired while I am not a little tired.她一点也不累，而我却很累。

She’s kind and patient，and she explains English grammar so clearly that even I can understand it!

她和善且有耐心，语法讲解得如此清晰，甚至连我也能听懂！

so...that...如此…以至于…；如此…使得…，引起结果状语从句，此处so是副词，口语中可省略that。

so...that...句式的常见用法如下： so + adj./adv.that…

so + adj.+ a/an + n.+ that so + little/few/much/many…that 例句：This problem is so difficult that nobody can work it out.这道题太难，没有一个人能解出来。

He was so excited that he could not speak.他兴奋得连话都说不出来了。I ate so much food that I was almost sick.我吃的太多了，差点想呕吐。There are so many people in the street that I can’t get through.街上有那么多人，我过不去。

I made so many mistakes that I failed in the exam.我出了那么多错，以至于考试不及格。

There was so little water left that only little children were given some.剩下的水不多了，只给小孩分了一些。such…that用法

such + a/an + adj.+ n.+ that such + adj.+ un.+ that such + adj.+ pl.n.+ that It is so fine a day that I want to go out for a walk.＝It is such a fine day that I want to go out for a walk.＝It is such fine weather that I’d like to go out for a walk.天气如此好，以至于我想出去散步。

They are such good teachers that we all respect them.他们是那么好的老师，我们都尊敬他们。

They are such small shoes that I can’t put them on.这双鞋这么小我穿不上。5.Physics will never be my favourite leon，but I think that I’ll do well in the exam with Mrs Chen teaching me.虽然物理永远不会是我最喜欢的课，但是我认为有陈老师教我，我会在考试中取得好成绩。

“with＋宾语＋宾语补足语”构成复合结构，在句中常作状语(有时可作定语)，宾语补足语根据逻辑意义可以是形容词、副词、介词短语、不定式、现在分词、过去分词等。

例句：He is deep in thought，with his head in his hands.他双手抱着头陷入沉思。

“with复合结构”的其他形式还有： 1)with＋n./pron.＋动词不定式

With nothing to do，I had to go to sleep.因为没事可做，我只得睡觉。2)with＋n./pron.＋过去分词

With everything bought，he went home.一切都买好了，他回家了。

3)with＋n./pron.＋现在分词

Something many people spoke at the same time，with nobody stopping them.有时许多人同时发言，没有人阻止他们。4)with＋n./pron.＋副词

They went out of the room，with the light out.灯熄了，他们走出房间。5)with＋n./pron.＋形容词

He used to sleep with the window open.他过去常常开着窗户睡觉。

It’s bad manners to talk with your mouth full.含着满嘴食物说话是不礼貌的。

She said goodbye with tears in her eyes.她含泪说再见。

We found her house easily with the guide leading the way.由向导带路，我们很容易地找到了她的家。

在“with＋宾语＋宾语补足语”的复合结构中，现在分词作宾补时强调主动和进行，过去分词作宾补时强调被动和完成，不定式作宾补时表示动作还未发生。

6.I’d rather study history than geography because I can learn a lot from many historical figures.我宁愿学历史而不愿学地理，因为我可以从许多历史人物中学到许多东西。

1)would rather(not)do sth.宁愿(不)做某事

would rather do sth.than do sth.宁愿……，也不……

＝would do sth.rather than do sth.＝prefer to do sth.rather than do sth.2)would rather后跟从句时，从句中要用虚拟语气

would rather sb.did sth.宁愿某人做某事(用一般过去时表示对现在和将来的虚拟)would rather sb.had done sth.宁愿某人做过某事(过去完成时表示对过去的虚拟)例句：1）He’d rather work in the countryside.我宁可到农村去工作。

2）I would rather take the train than take the bus.我宁愿坐火车而不愿坐公共汽车。

3）He would rather he hadn’t made the promise.他宁愿自己没许下诺言。

第三单元

1.distance n.距离;远处；远方 1)in the distance在远处；在远方

at a distance稍远处

within hearing/walking distance 在能听到叫声/步行可及的地方

keep sb.at a distance与某人保持距离；不与某人亲近

keep one’s distance(from sb./sth.)与…保持一定距离；对…冷淡，疏远 2)distant adj.远的；疏远的；稀疏的；冷淡的be distant towards sb.对某人冷淡

be distant from离…… 远

2.1)abandoned

adj.(be left and no longer wanted, used or needed)

被遗弃的；被离弃的；被抛弃的2)abandon v．遗弃(某人)；离弃；逃离；放弃；n.尽情，放纵

abandon sth./sb.放弃(某物), 遗弃(某人)

辨析: abandon和desert abandon和desert 都可以表示“遗弃，抛弃”。但是abandon还可以表示“完全放弃(尤指已开始的某事物，如计划，方案等)”。3.scenery n．风景，景色 ①To enjoy the scenery，he chose to travel by train.为了欣赏风景，他选择乘火车旅游。②Our train paes through the charming scenery.我们的列车在迷人的风景中穿行。辨析：scenery，scene与sight 1)scenery n．(general natural features of an area, eg.mountains, valleys, rivers)是不可数名词,(总称)风景，景色，指自然风光.是由多个scene构成的 On the way to Guilin，we stopped again and again to enjoy the scenery.在去桂林的路上，我们不时地停下来欣赏沿途的风景。admire/enjoy scenery

欣赏风景 2)scene n．指一眼可以浏览的风景，不限于自然景色。也可表示“现场”“场景”，戏剧中的“一幕”，大多包括景物中的人及活动。You can see a beautiful scene from the top of the mountain.自山顶远眺，你可以看到美丽的景色。on the scene 在现场，到现场

They stood there, gazing at the happy scene of children playing in the park.他们站在那里注视着孩子们在公园里玩耍的欢乐场面。

3)view 常指从某处所看到的景物，还可以指“视野，视域”。come into view 进入视野，被看见

If you stand up, you can get a better view of the match.如果你站起来，你就能看清楚比赛。

4)sight 表示眼睛所看到的“情景，景象”，可以是美丽的，也可以是悲惨的；(尤指)奇观；(复数时)常指某一地区的名胜等。还可以指“视力，视野，看见”

Plenty of foreign visitors come to see the sights of Beijing every year.每年都有大量外国游客来参观北京的名胜。lose one’s sight 失明 at the sight of 一看见

in(within)/out of(sb.’s)sight(指物体等)看得见/看不见 come into sight 进入视野 see the sights 游览名胜

What a poor sight.The trees were all cut down.多么悲惨的景象，树木都被砍倒了。

4.shoot vt.射杀；投篮，射门；拍摄(照片，电影)1)shoot sb.射伤某人，射中某人

shoot at sb./sth.2)shoot an angry glance/a question at sb.＝shoot sb.an angry glance/a question 突然瞪了某人一眼/突然向某人发问 5.journey;travel;trip;tour;voyage区别：

1)journey主要指单程较远距离的海、陆、空“旅行”，表示“去旅行”时，英语该说go on a journey，而不说go to a journey Mr.Smith made a journey from Paris to New York.史密斯先生作了一次从巴黎到纽约的旅行。A pleasant journey to you.祝你一路平安。

2)travel 一般指长途旅行，或到国外或远方旅行。与journey不同之处，在于不着重某一目的地，有到各地“游历”的意思，作名词时常用复数形式。地道的英语一般使用to go travel的表达更多。He has just returned from his travels.他刚刚旅行回来 One day in his travels in China, he got to Guangzhou.他在中国旅行期间，有一天他到达广州．

3)trip 一般指短距离旅行，直达目的地的旅行。在日常用语中，trip可与journey通用。

have a good trip/ journey I am going on a trip to the seaside during the summer holidays.暑假期间我将去海边旅行。

He went on a trip/ journey to Paris.他到巴黎旅行去了。

4)tour 旅行，周游，观光，主要目的地是游览或视察，距离可长可短，常带有“最后回到出发地”的含义。

一般团队游都是tour，带有导游的是Guide Tour。法国5日游：5-day Tour to France He is making a tour of the world.他周游世界去了。5)voyage 一趟旅程，尤指海上之旅

Many are finding that the most pleasant way to travel is a voyage on a cruise ship.许多人认为最痛快的旅行方式，是搭乘游轮，来一趟逐波之行。6.frighten vt.使惊恐，吓唬；vi.惊恐，害怕，受惊吓 1)frighten sb.into doing sth.吓得某人做某事 frighten sb.out of doing sth.吓得某人不做某事 2)frightened adj.害怕的；受到惊吓的be frightened at/by对……害怕，被……吓坏了 be frightened to do sth.做……而害怕 3)frightening adj.令人恐惧的，可怕的 4)fright n．恐惧，害

①The man frightened the old lady into signing the paper.那个人恐吓那位老妇人，使她签了字据。②The old man picked up a stone and threw at the dog to frighten it away.为了把狗吓走，这位老人捡起了一块石头朝它扔去。③The little girl was frightened by the big dog.小女孩被那只大狗给吓坏了。④The child stared at the man with frightened eyes.那小孩用惊恐的眼神盯着那个男人。⑤His frightening look frightened the little girl.他令人害怕的样子吓坏了这个小姑娘。

6.event n.事件，大事；比赛项目；公开活动，社交场合 辨析: event, incident和accident

1)event指“重大历史事件”或日常生活中的重要事件。

2)incident通常指不太重要但却又引人注意的小事。事件。3)accident指事故，往往指“偶然的事故”，尤其是不幸的事故。by accident 是指“偶然地”。词组：

1.get on 上(车、船等)get off 下(车、船等)；下班；离开，动身 get into 上（车）get out of 下（车）

get on/along(with sb./sth.)相处融洽； 进展

get around/round/about 四处走动(旅行)；(消息等)传开 get away from

摆脱；离开 get acro

使理解；使明白

get down to

认真地静下心(工作)get over

痊愈，康复，恢复；克服，战胜

get through通过(考试等)；打通电话；熬过(困境)；完成 get together 相聚，聚会

2.take off(飞机)起飞；突然开始成功；开始走红；脱(衣服等)；匆匆离开；休假

take away拿走；夺去 take back收回；带回 take in吸收；接纳；欺骗 take on呈现；雇用 take over接管；接任

take up拿起；占据；着手 做 ①Because of heavy fog，the plane couldn’t take off on time.由于大雾，飞机不能按时起飞。②As soon as he got home，he took off his coat.他一到家就脱掉外套。③His mother was seriously ill，so he had to take a day off.他妈妈病得严重，所以他不得不请一天假。④His career took off when he was only ten.十岁时他的事业便飞黄腾达了。

3.be short for(to be a shorter way of saying a name)为……的缩写 run/go short(of)

短缺，不足 in short / in a nutshell 简言之 for short

缩写，简称

4.1)refer to提到，说到，涉及；查阅，参考；关系到 2)refer to...as将……称为…… 3)refer to a dictionary查词 典

5.Where do you think most of the people live，in the central part of the country or on the coast? 你认为大多数人生活在哪里，国家的中部还是沿海？ do you think是插入语，位于疑问词之后，而且其后面要用陈述句语序。其结构为：特殊疑问词＋do you think＋陈述句语序。除think之外，还有believe，consider，suppose，imagine，gue和suggest ①What do you think he is doing？你认为他现在在做什么？ ②Who do you suppose is fit for the job? 你认为谁能胜任这份工作？ ③Who do you suggest be sent to work on the farm? 你建议派谁去农场工作呢？

I think，I believe, I suppose, I gue，I imagine，I find，I say，I know等也可用做插入语，臵于句中或句末，一般用逗号隔开；此类插入语，若臵于定语从句中，可不用标点。④It is impoible，I think，that we should finish the job in such a short period of time.我认为在这么短的时间内完成这项工作是不可能的。6.请出示你的票好吗？

1)Would you mind...后面接名词、动名词以及if引导的从句。if从句中要用一般过去时表示虚拟语气。但Do you mind后的if从句不用过去时态。2)mind sb.doing sth.介意某人做某事

mind your own busine管你自己的事，别管闲事 3)keep sth.in mind记住……

make up one’s mind下决心…… go/be out of one’s mind发狂，发疯 ①Would you mind my/me smoking here? ＝Would you mind if I smoked here? ＝Do you mind if I smoke here？我在这儿抽烟你不介意吧？ ②I have so much to do—I feel like I’m going out of my mind.我有那么多事情要做——我觉得自己都快要疯了。③It’s a good idea—I’ll keep it in mind.这是个好主意——我要记在心里。④He has made up his mind to resign，and that’s final.他已下决心辞职，而且就那么定了。

回答Would you mind或Do you mind...？问句时，一定要特别注意前后文的一致性，常见的表“不介意”的答语有：No, of course not./Certainly

not./Not at all./Go ahead./Do as you like./Not in the least.表示“介意”或“不同意”时则常用较委婉的方式加以拒绝。如：

I’m sorry but I do./Sorry, you’d better not./I’m afraid you can’t./I’d rather you didn’t./I’m sorry, but it’s not allowed.等

I’m sorry，but I do；Yes，I do mind；I’m sorry，but you’d better not.句型公式 感叹句

what引导的感叹句句型公式：

(1)What a/an(＋adj.)＋单数名词＋主语＋谓语！

(2)What(＋adj.)＋复数名词/不可数名词＋主语＋谓语！how引导的感叹句句型公式：

(1)How＋adj.＋a/an＋单数可数名词＋主语＋谓语！(2)How＋adj./adv.＋主语＋谓语！(3)How＋主语＋谓语！

what 引导的感叹句的第一个句型和how引导的第一个句型可以互相转换。另外what 引导的感叹句中的形容词可以省略；what和how 引导的感叹句中的主谓部分也经常省略。Would you mind showing me your ticket？/ Would you mind if I saw your ticket?

请出示你的票好吗？ 练习题： 语法专练

本单元语法——以ed形式作定语和过去时态的时间状语 1．The trees ______in the storm have been moved off the road.A．being blown down

B．blown down C．blowing down

D．to blow down 2．—Can those ______at the back of the claroom hear me? —No problem.A．seat

B．sit C．seated

D．sat 3．It is one of the funniest things ______on the Internet so far this year.A．finding

B．being found

C．to find D．found 4．(2009年江西卷)—Do you want a lift home? —It’s very kind of you，but I have to work late in the office.I overslept this morning because my alarm

clock ______.A．doesn’t go off B．won’t go off

C．wasn’t going off

D．didn’t go off

【解析】 句意为：——你想搭车回家吗？——你太好了，但是我不得不在办公室加班。因为闹钟没响，我今天早晨睡过头了。由题干中的overslept可知本句应该用一般过去时故排除A、B两项，语境中又没有强调在过去的某个时间点或时间段正在做某事，故排除C项。5．(2009年山东卷)I was out of town at the time，so I don’t know exactly how it ______.A．was happening

B．happened

C．happens

D．has happened