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I want to improve my English, but I don’t know _________. What can you suggest?
A. when B. how C. why D. where
【分析】此题应选 B，其余三项均有可能误选，其实此句为省略句，补完整应为 … but I don’t know how to improve my English. 请看以下类似试题：
(1) I think the door is locked, but I’d better go and make sure it _________.
A. does B. has C. was D. is
答案选D，为 …and make sure it is locked. 之省略。
(2) Dr Black comes from either Oxford or Cambridge. I can’t remember _________.
A. where B. there C. which D. that
答案选C，为I can’t remember which city he comes from. 之省略。
(3) Some of the answers were correct, but I don’t remember _________.
A. where B. what C. which D. that
答案选C，I don’t remember which 后省略了 ones (were correct)。
(3) He didn’t sell half as many computers as he thought he _________.
A. had B. was C. would D. sold
答案选C，为He didn’t sell half as many computers as he thought he would sell. 之省略。
(4) I touched the door to see if the paint was still wet, and it _________.
A. did B. was C. had D. might
答案选B，为…and it was wet. 之省略。