–Excuse me sir but I don’t think you can smoke here.–Really sorry. I this is a non-smok

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。