——I’m sorry , but there’s no smoking on this flight .
——Oh, I that .Sorry , I won’t again .
A. don’t know
B. didn’t know
C. won’t know
D. haven’t known
网友回答
A. don’t know
(答案→)B. didn’t know
C. won’t know
D. haven’t known
解析:考查时态。句意:很抱歉,在飞机上不能吸烟。噢,我不知道,对不起,我再也不吸了。说话之前不知道,故用一般过去式。所以选B。