----I’m sorry, but there is 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
----I’m sorry, but there is 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
B
本题考查在具体语言环境下使用基本时态的能力。“不知道”是发生在说话之前的事情，所以我们要用瞬间过去时。