题目内容

——I’m sorry , but there’s 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
考查时态。句意：很抱歉，在飞机上不能吸烟。噢，我不知道，对不起，我再也不吸了。说话之前不知道，故用一般过去式。所以选B。
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