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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
考查时态。句意:对不起,但是这个航班上不许吸烟、——哦,我不知道。抱歉,我不会再吸了。结合语境可知下文描述的是刚才的动作,故用一般过去时态。选B。
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