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’t know _________. What can you suggest?
A. when B. how C. why D. where
【分析】此題應選 B，其余三項均有可能誤選，其實此句為省略句，補完整應為 … but I don’t know how to improve my English.
請看以下類似試題：(1) I think the door is locked, but I’
答案選D，為 …and make sure it is locked. 之省略。
’t remember _________. A. where B. there C. which D. that
答案選C，為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
答案選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
答案選C，為He didn’t sell half as many computers as he thought he would sell. 之省略。