一Excuse me,sir.This is a non-smoking train.
一Oh,sorry.I____ know that.
A.haven’t known | B.hadn’t know |
C.didn’t know | D.don’t know |
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一Excuse me,sir.This is a non-smoking train.
一Oh,sorry.I____ know that.
A.haven’t known | B.hadn’t know |
C.didn’t know | D.don’t know |