----- _______ in the workshop. Please stop it.
----- Sorry. I________.
A．Smoking is not allowed, don’t knowB．Not smoking, an not sure
C．Don’t smoke, have no idea 　D．Smoking is forbidden, didn’t know
D
 "不知道"　是在對(duì)方告訴之前，故需過去時(shí)。
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