—I’m sorry but there’s no smoking on this flight.—Oh I that.Sorry I won’t again.A. don’

问题补充：

—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

答案：

A. don’t know

(答案→)B. didn’t know

C. won’t know

D. haven’t known

解析：本题考查动词时态。根据句意“在(说话)之前不知道飞机上不能抽烟” 可知，这是对过去事实的叙述，所以用一般过去时。