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—Don't smoke here, Sir. 一Oh, sorry. I it...

Don't smoke here, Sir.

Oh, sorry.  I      it was a non-smoking area.

A. know    B. knew    C. don't know    D. didn't know

 

D 【解析】句意:--先生,这里不能吸烟。--哦,对不起,我不知道这是禁烟区。根据Oh, sorry.可知,在对方告诉他“这里不能吸烟”之前,他不知道这是禁烟区。所以句子应该用一般过去时。故选D。  
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