9.The TV set he _________ works well now.

　A. has repairing　　　　 B. having repaired

　C. has been repaired　　 D. has had repaired

　选D。本题考查学生综合能力。首先要知道he________是定语从句，对先行词The TV set进行修饰。由于the TV set在定语从句中作宾语，所以可以省略关系代词that或which。而定语从句中有have sth done结构，即文章的句子为：The TV set that/ which he has had repaired works well now.主句为The TV set works well now.

8.There are a lot _______ people today than yesterday.

　A. of　 B. more　 C. most　 D. /

　选B。本题容易选A。因为许多学生很快会联想到a lot of短语。其实，只需要仔细看完句子就会发现句子的后面有than,暗示要选比较等级，而比较级前面用a lot来加强语气。

7.Wang Wei is one of many Chinese students _______ “on the go’.

　A. who lives life　　　　 B. who live life

　C. that lives living　　　 D. that live living

　选B。 “one of +名词/代词“接定语从句时，先行词是前面的名词或代词，而不是one,因此可以排除A和C;再根据live用作及物动词时一般要接同源宾语live (a happy/ sad/poor, etc.) life，因此选B。其中on the go可以看着是相当于形容词的短语作定语。

6.With the development of science and technology, people’s life _______ in the past few years.

　A. improved　　　 B. has improved

　C. is improving　 D. had improved

　选B。根据句子后面的时间状语in the past few years可以知道句子应该使用现在完成时。

5.We have moved into a four-room flat so far. Our room is between _____.

　A. Mary’s and Helen’s　 B. Mary and Helen’s

　C. Mary and Helen　　　　 D. Mary’s and Helen

　选A。由句子的意思可以知道这里表示两人各自的房间。

4.---I wonder why Mr Green hasn’t showed up at the meeting yet.

　---I’m not sure, but he _______ in a traffic jam driving here.

　A. could be stuck　　　　 B. might stuck

　C. might have been stuck D. must have stuck

　选C。表示对过去已经发生事情的推测应该用情态动词的完成时形式，但might的可能性不大；结合上下文的意思可以知道应该用被动形式。

3. When I got to the cinema, the film _____ for five minutes.

　A. had begun　　　 B. has been on

　C. has begun　　　 D. had been on

　选D。电影开始了五分钟，for five minutes为一段时间要求谓语动词要用延续性动词，故A和C先排除，而从句的动作发生在主句动作之后。

2. Mary had promised to give me a ticket for tomorrow. She failed, ____.

　A. either　　 B. though　　 C. but　　 D. too

　选B。结合上下文意思我们可以知道本题表示转折关系，先排除A、D；而but为并列连词通常放在句首或句子中间起连接作用。故选B。

1.-He must be busy doing his homework right now.

　-I imagine____.

　A. that　　 B. to　　 C. so　　 D. it

　选C。I imagine so=I think so,

17、已知数列，，

(1)求证是等差数列；　 (2)求数列的通项公式。