问题
单项选择题
Smoking is forbidden in the workshop, please stop it. Sorry, I（）
A.am not sure
B.have no idea
C.do know
D.did not know
答案
参考答案：D
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Smoking is forbidden in the workshop, please stop it. Sorry, I（）
A.am not sure
B.have no idea
C.do know
D.did not know
参考答案：D