’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。

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