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----I’m sorry, but there is no smoking on this flight.
----Oh, I _____ that. Sorry, I won’t again.
A.don’t knowB.didn’t knowC.won’t knowD.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。
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