3. 状语从句(13)

17. Scientists say it may be five or six years _____ it is possible to test this medicine on human

patients.（2004-福建）

A. since B. after

C. before D. when

18. You should try to get a good night’s sleep much work you have to do.（2004-湖北）

A. however B. no matter

C. although D. whatever

19. We were told that we should follow the main road _____ we reached the central railway

station. （2004-辽宁）

A. whenever B. until

C. while D. wherever

20. ______ you call me to say you’re not coming, I'll see you at the theatre.（2004-全国II）

A. Though B. Whether

C. Until D. Unless

21. Several weeks had gone by _____ I realized the painting was missing.（2004-全国IV）

A. as B. before

C. since D. when

22. Jasmine was holidaying with her family in a wildlife park _____ she was bitten on the leg by

al lion.（2004-上海）

A. when B. while

C. since D. once

23. Parents should take seriously their children’s requests for sunglasses _____ eye protection is

necessary in sunny weather. （2004-上海）

A. because B. through

C. unless D. if

24. ______ , I have to put it away and focus my attention on study this week. (2004-上海春)

A. However the story is amusing B. No matter amusing the story is

C. However amusing the story is D. No matter how the story is amusing

25. It was evening ______ we reached the little town of Winchester. （2004-天津）

A. that B. until

C. since D. before

26. Don’t be afraid of asking for help _____ it is needed.（2003-全国）

A. unless B. since

C. although D. when

27. I would appreciate it _____ you call back this afternoon for the doctor’s appointment.（2003-

上海）

A. until B. if

C. when D. that

28. He was about to tell me the secret _____ someone patted him on the shoulder. (2002-上海)

A. as B. until

C. while D. when

29. The famous scientist grew up _____ he was born and in 1930 he came to Shanghai.（2002上

海春）

A. when B. whenever

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