Nick didn't have dinner he finished doing homework.A. if B. when C. until D. after C [解析]句意:Nick直到写完作业才吃晚饭.A. if 如果.是否,B. when 当--时,C. until 到--为止.not-until直到--才 , D. after在--之后.根据句意结合关键词didn't.可以� 题目和参考答案——青夏教育精英家教网——

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Nick didn't have dinner he finished doing homework.

A. if B. when C. until D. after

C 【解析】句意：Nick直到写完作业才吃晚饭。A. if 如果，是否；B. when 当……时；C. until 到……为止，not…until直到……才； D. after在……之后。根据句意结合关键词didn't，可以判断处此句应用固定表达not…until来完成，意为“直到……才·”引导一个时间状语从句，故选C

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同义句转换

1.It is the best time to exercise in the morning.

_______ is the best time ________ exercising in the morning.

2.There may be some snow`tomorrow.

________ ________ will snow tomorrow.

3.I borrowed the book three days ago.

I ______ ________ the book for three days.

4.Kitty bought the pen two days ago.

Kitty ________ ________ the pen for two days.

5.The girl is my sister and she has long hair.

The girl _______ long hair is my sister.

1.Itfor 2.Maybeit 3.have kept 4.has had 5.with 【解析】 1.句意：早晨是锻炼的最佳时间。原句使用的句型是It is the best time to do sth.“这是做某事的最佳时间”。It is the best time to do sth.相当于It is the best time for doing ...

Her daughter began to play _____ piano when she was four years old. Now she's very good at it.

A. an B. a C. / D. the

D 【解析】句意：她女儿四岁时开始弹钢琴。现在她很擅长。演奏（play）某种乐器前使用冠词the，即play the+乐器，本句“弹钢琴”是play the piano，结合句意和选项可知选D。

I didn't realize he was a famous scientist you told me.

A. until B. because C. since

A 【解析】句意：直到你告诉我，我才知道他是一位出名的科学家。A. until到…为止；B. because 因为；C. since既然，因为。本题考查固定句式not…until…直到……才。其用法是如果（主）句中的谓语是终止性动词，应采用“not…until”结构，意为“到……时候才” 根据句子结构，结合选项，故选A。

（2017·四川乐山· 30）—Did you say anything to your parents ________ they shouted at you?

—No，I was afraid to talk back. They looked really serious and scary.

A. unless B. why C. when

C 【解析】句意：当你父母对你大喊大叫时，你对他们说什么了吗？ ——没有，我不敢顶嘴，他们看起来真的很严肃，很吓人。A. unless 除非 B. why 为什么 C. when当···时候。根据句意可知，“当你父母吼你的时候”表时间，故使用C when来引导时间状语从句。

______it is often cold in the mountains, you need to wear warm clothes.

A. Though B. Unless C. As D. Until

C 【解析】句意：由于在山里常常很冷，你需要穿暖和的衣服。A. Though虽然；B. Unless除非；C. As由于；D. Until直到…时。根据题干______it is often cold in the mountains, you need to wear warm clothes.可知此处用as来引导原因状语从句，即“由于在山里常常很冷，你需要穿暖和的衣服”，故选C。 ...

I like dancing, ______ I don’t have enough time to practice it.

A. or B. so C. but D. because

C 【解析】句意：我喜欢跳舞，但我没有足够的时间练习。A. or连词，或者；B. so连词，所以、那么； C. but连词，但是；D. because连词，因为。前文“喜欢跳舞”与后文“没有足够的时间练习”之间是转折关系。故选：C。

Betty ___________ hard since last term. That’s why her exam results are so good!

A. has worked B. will work C. worked D. was working

A 【解析】句意：自上学期以来贝蒂一直努力学习。那就是她考试成绩如此好的原因！考查动词时态。since last term自从上学期以来，表示的是一段时间；work工作，动词，是持续性的。根据句意，结合句子结构，可知本句是现在完成时态，Betty是三单人称，需用has构成完成时，故选A。

A little effort every day, and you a big difference.

A. makes B. made C. have made D. will make

D 【解析】句意：------每天努力一点，你会有很大的不同。A. makes一般现在时，make的三单形式；B. made一般过去时；C. have made现在完成时；D. will make一般将来时。祈使句也可用来表条件，常用于“祈使句+and / or +陈述句（一般将来时）”句型中，and意思是“那么”，or是“否则”的意思，相当于if引导的条件状语从句，例如，Take more...