什么是转基因状语从句
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1___ the fire broke out,all the students were sleeping soundly.
A when B while
2.Father was preparing a report ___ I was playing PC games.
A when B while C as
3.___ you grow older, you'll know better and better about yourlf.
A when B while C as
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4.___ he was reading, he was shaking his head, which surely slowed down his reading speed.
A when B while C as
5.My cap was blown away ___ I sat down.
A when B while C as
6.When you ___ there,ring me up.
A get B will get C got
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7.I didn't know anything about it, ___ you told me.
A when B while C as D until
8.___ all the fish had died did the farmers realize how rious the pollution was.
A Not until B Until
9.Great changes have taken place ___ you left the city.
A until B when C as D since
10.I have returned home twice ___ I ttled down in the States.
A until B when C as D since
11.He has written to me frequently ___ he was ill.
A until B when C as D since
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12.读书好处的句子I graduated from that school 10 years ago. I haven't been there ___ .
A since B ever since
13.I must finish this letter ___ I go home.
A before B since
前生后世状语从句
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1.解析：A。When引导的时间状语从句，动词既可以使延续性的，也可以是终止性的。While引导的时间状语从句只能是延续性的。火灾发生是终止性的，一瞬间发生，故不能用while。
2.解析：B。When和while都可以引导含延续性动作的时间状语从句，但是当两个表示时间延续的动作同时发生而又具有对比意味时，用while，这样的复合句中，主句和从句时态一致，这里父亲准备报告和我玩游戏两个动作都是过去进行时。
3.解析：C。表述两个发展变化中的情况，用as引导时间状语从句，含有“随着。。。，然后。。”的意思。
4.解析：C。表示“一边。。。一边。。。”的意思，用as引导时间状语从句。
5.解析：C。表示短暂动作发生时，另一行为伴随发生，常用as引导时间状语从句。
6.解析：A。虽然get there是发生在将来的动作，但是不用将来时，在时间状语从句中用一般现在是表示将来，用一般过去式表示过去将来时。
写给爸爸的信
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7.解析：D。until/till 无差别，都指某一持续性动作或某一状态持续到某一时间点，可译为“直到。。。为止”。
8.解析：A。Not until 引导时间状语从句，意思是：“直到。。。（某个时间点）才。。。（主句动作发生）”，且主句部分主语和谓语应倒装。不能说“Not until the fish had died the farmers realized how rious the pollution was."多运动的好处
9.解析：D。Sice引导时间状语从句表示“自某一时间点以来。。。”。可以翻译成“自从。。”。主句可以用持续性动词，也可以用非持续性动词。
低血压多少正常
10.解析：D。Since引导时间状语从句，主句是非持续性动词时，则主句中强调动作的频率或者多次发生，return home是非持续性动作，这里就强调回家了两次。
11.解析：D。Since引导的时间状语从句中，如若是持续性动词，则理解为状语从句表示的是该持续性动作终止的时间点。本题since he was ill就表示“从他病好开始”。
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12.解析：B。Since和ever since可以用作副词，意为“自那以来”，since一般不用于终止性动词，除非表示动词的频率和多次，如题10. ever since更加强调“某一动作或状态一直”，意为“从。。。之后，一直。。。”，他所修饰的主句谓语动词不能为终止性动词。
13.解析：A。Before引导时间状语从句，表示“在。。。之前”。
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14.I'll give you an answer ___ I've finished reading your file.
A since B before C as soon as
15.We live ___ the road cross the river.
A when B as soon as C where
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16.He was punished only ___ he broke the law.
A becau B as C since
17.___ it was a public holiday, all the shops were shut.
A becau B as C since
18.___ everyone makes mistakes, you shouldn't always critisize him.
A becau B as C since
19.Let's stay home，___ it's raining hard outside.
A becau B as C since D for
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20.Take a hat with you ___ the weather is very hot.
A so that B in order that C in ca
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21.The text was ___ boring (that) I gave up reading it half way through.
A so B such
22.He drove ___ carelessly that he was almost lost his life.
A so B such
23.He made ___ many mistakes that he failed the exam once again.
A so B such
24.It ___ happened that he didn't receive my invitation.
A so B such
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25.It was ___ a terrible day that none of us would find an excu for going out to play.
A so B such
26.They are ___ good children that we all love them.
A so B such
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14.解析：C。As soon as引导时间状语从句，意为“一。。。就。。。”，引导的时间状语从句需用一般时态替代将来时态。
15.解析：C。只有where可以引导地点状语从句。
P346
16.解析：A。Becau，as，since都有“因为”之意，becau语气最强，用于回答why引起的疑问，可以和强调次only（只是），merely（仅仅），just（仅仅）及否定词not连用，所引导的原因状语从句常位于主句之后，用于强调结构式，可以放在主句之前。如：It is becau he broke the law that he was punished. as语气最弱，所表达的原因比较明显，或是已知的事实，不需要加强调词，多放在主句之前。Since语气最弱，表示对方已知的事
实，相当于“既然”，和as一样也不能加强调词和not。本题有强调词only，所以用becau合适。
17.解析：B。原因状语从句放在主句前，且语气较弱，又没有“既然”的意思，所以选as，这里引导的原因状语从句所表达的原因比较明显。
18.解析：C。原因状语从句在主句前，不选becau，且话里边有“既然”的意思，选C。
19.解析：D。For也有“因为”的意思，可是for是一个等立连词，连接的是并列句不是原因状语从句，用来做附加说明，和另一句子没有明显的因果关系。
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20.解析：C。In ca的意思为“目的是，以防、以免有某种情况发生”，引导目的状语从句。
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21.解析：A。So+形容词+that引导目的状语从句的句式。
22.解析：A。So+副词+that引导目的状语从句的句式。
23.解析：A。So+many/few/little/much+相应形式的名词+that引导结果状语从句的句式。
24.解析：A。So+动词+that引导结果状语从句的句式。
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25.解析：B。Such+a+形容词+可数名词单数+that引导结果状语从句的句式。
26.解析：B。Such+形容词+可数名词复数+that引导结果状语从句的句式。
27.This was ___ fine music that it was worth listening to twice.
石碣中学A so B such
28.So excited ___ that he could not fall into sleep.
A was he B he was
29.If the weather ___ terrible next week,, we'll put off the summer camp.
A is B will be C was
30.Father told me if i ___ hard he would buy me a special gift.
A work B worked C would work
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31.Young though she is,___ she has travelled to many countries to put on shows.
