21. _________black clouds covering the sky，he stopped his work and went home.

　　A. To see   B. Having been seeing

　　C. Seeing   D. having to see

　　答案：（C）

　　现在分词作状语从句，主动态；

　　22. I advised _________，but he turned me a deaf ear.

　　A. him not to smoke again   B. him to smoke not again

　　C. him to not smoke again   D. not him to smoke again

　　答案：（A）

　　不定式的否定式词序：not to do

　　23. _________，he works very late at night.

　　A. Having bee choosing director   B. Choosing director

　　C. Having chosen director         D. Being chosen director

　　答案：（D）

　　现在分词作状语从句，被动态；

　　24. She prefers_________ taking an examination.

　　A. writing a term paper than    B. being written for a term paper

　　C. to write that a term paper   D. writing a term paper to

　　prefer doing…to doing…

　　25. The clerk is going to take bus money.

　　A. by saving   B. to save   C. for to save   D. saving

　　答案：（B）

　　不定式作目的状语；

　　26. The brakes need _________.

　　A. adjusting   B. adjusted   C. to adjustment   D. to adjust

　　答案：（A）

　　need sb. to do…需要某人做… need doing…需要被做 need sth.done 需要请人做；

　　27. Henry and Bady_________ to the parties at the Trade Union every Saturday.

　　A. are used to go   B. use to go   C. would stay   D. shall stay

　　答案：（C）

　　be used to do…被用于做 be used to doing… 习惯于；used to do…过去常常（现在不了）；

　　28. Her government insisted _________she until she finished her degree.

　　A. stayed    B. stay    C. would stay    D. shall stay

　　答案：（B）

　　虚拟语气在宾语从句中，是should 动词原形或只用动词原形；这类谓语动词有：insist，suggest，order，demand，command，propose，arrange，request，require，desire，recommend 等；

　　29. Excuse me，but it is necessary that_________ your temperature .

　　A. be taken    B. taking    C. to take    D. was taken

　　答案：（A）

　　虚拟语气在主语从句中，是should 动词原形、should have done .或只用动词原形；这类词有：

　　It is（was） necessary （important，desirable，imperative，advisable，desired，suggested，proposed，settled，requested，decided） that…

　　30.Hix Chemistry teacher recommends that he_________ A regular degree program.

　　A. will begin    B. begins    C. begin    D. is beginning

　　答案：（C）

　　见第28题；