----- _______ 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

D


解析:

 "不知道"　是在對方告訴之前，故需過去時。

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