20. The Olympic Games ____ held every ____ years.

A.is;four　 B.are;four　 C.is;five　 D.are;five

key: B

19. A chemical works____ built there.

A. is to being　 B.have been　 C. were to　 D.has been

key: D works 工厂　

18. Chairman Mao' s works ____ published.

A. has been　 B.have been　 C.was　 D.is

key: B works 著作,作品 毛主席选集已经出版了,当然是复数了.

17. The Arabian Nights ____ well known to the English.

A. is　　 B. are　 C. was　 D. were

key: A the Arabian Nights-天方夜谭,这是一本书,谓语动词当然用单数了.

16. The number of deer, mountain lions and wild roses ____ much if people

　 leave things as they are.

A. doesn' t change　 B.don't change　ge　ged

key: A

15. A large number of students in our class____ girls.

A. are　 B. was　　 C. is　　 D. be

key: A a large number of... 很多,相当于many的用法;比较: the number of...指的是数字,所以谓语动词用单数的形式

14. There ____ a pen, two pencils and three books on the desk.

A.are　　 B.is　　 C.has　　 D.have

key: B 就近原则

13. The great writer and professor____.

A. is an old man　　　　　　　　　 B. are both old men

C. is an old man and a young man　　 D. were two Chinese

key: A

12. The League secretary and the monitor____ asked to attend the meeting

　 this afternoon.

A.is　　 B.was　　 C.are　　 D.is being

key: C the League secretary和 the monitor 两个人;比较: the doctor and writer is coming...

11. Alice, together with two boys,____ for having broken the rule.

A. was punished　 B. punished　 C. were punished　 D. being punished

key: A