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Excuse me sir Smoking is not allowed here

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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
抽烟者是在被告知此地不能抽烟之前还不知道这里是不允许抽烟的,当被告知的时候,他就知道了,也就是说,她现在知道了,他不知道的状态是在此刻之前,所以不能用一般现在时.