问题补充:
–Excuse me, sir, but I don’t think you can smoke here.
–Really sorry. I this is a non-smoking area.
A. don’t know
B. didn’t know
C. have no idea
D. haven’t known
答案:
A. don’t know
(答案→)B. didn’t know
C. have no idea
D. haven’t known
解析: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。