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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