问题描述：
Excuse me sir Smoking is not allowed here
Excuse me ,sir.Smoking is not allowed here
Oh sorry ,I ()
A.have known B.don't know C.didn't known D.hadn't known
为什么无能用B啊
Excuse me ,sir.Smoking is not allowed here
Oh sorry ,I ()
A.have known B.don't know C.didn't known D.hadn't known
为什么无能用B啊
问题解答：
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