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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
本題考查在具體語言環(huán)境下使用基本時態(tài)的能力。“不知道”是發(fā)生在說話之前的事情，所以我們要用瞬間過去時。
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