成人英语三级

16. They will go home for winter vacation as soon as they ______ their exams.

A. have finished

B. finish

C. will finish

D. will have finished

17. About the sixth century A.D. when they few Europeans could read, the Chinese _____ paper.

A. invented

B. had invented

C. have invented

D. had been invented

18. I fell and hurt myself while I ______ tennis.

A. was playing

B. am playing

C. play

D. played

19. I _______ on the door for ten minutes now without an answer.

A. was knocking

B. an knocking

C. knocking

D. have been knocking

20. When you _____ this over with herm you should not see her any more.

A. talk

B. talked

C. will talk

D. talking

参考答案：16-20 BBADB

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