.---I’m sorry, but there’s no smoking room in this section on the train.
　 ---Oh, I _____ that, and I won’t smoke again.
　 
A．don’t knowB．won’t knowC．didn’t know 　　D．haven’t known
C
考查時態(tài)。句意：對不起，但是或者上這節(jié)車廂沒有吸煙室�！�，我不知道這件事，我不再吸煙了。結(jié)合語境可知前文描述的是過去的狀態(tài)，故用一般過去式。選C。
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