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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 know     B didn’t know    C. won’t know     D. haven’t known
B

試題分析：考查時態(tài)：句意：--很抱歉，但是飛機上個不能抽煙。--哦，我不知道，我不會再抽了。本題是在強調(diào)我過去不知道這個動作，所以用一般過去時態(tài)。選擇B。
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