题目

----- _______ in the workshop. Please stop it. ----- Sorry. I________. 　 A. Smoking is not allowed, don’t know 　 B. Not smoking, an not sure 　 C. Don’t smoke, have no idea 　        D. Smoking is forbidden, didn’t know 答案： D 解析:  "不知道"　是在对方告诉之前，故需过去时。

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