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–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
本题考查时态。根据语境可知“我不知道”指的是过去不知道,故用一般过去时。句意:——对不起,先生,我想这里你不能吸烟。——真的对不起,我不知道这是非吸烟区。
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