–Excuse me, sir, but I don’t think you can smoke here.
–Really sorry. I ______ this is a non-smoking area.
A．don’t knowB．didn’t knowC．have no ideaD．haven’t known
B
本題考查時(shí)態(tài)。根據(jù)語(yǔ)境可知“我不知道”指的是過去不知道，故用一般過去時(shí)。句意：——對(duì)不起，先生，我想這里你不能吸煙�！娴膶�(duì)不起，我不知道這是非吸煙區(qū)。
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