——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
考查時態(tài)。句意：很抱歉，在飛機(jī)上不能吸煙。噢，我不知道，對不起，我再也不吸了。說話之前不知道，故用一般過去式。所以選B。
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