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.---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
考查时态。句意:对不起,但是或者上这节车厢没有吸烟室。——哦,我不知道这件事,我不再吸烟了。结合语境可知前文描述的是过去的状态,故用一般过去式。选C。
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