Before you get into the teachers' office.You must knock( )the door.A.on B.in C.to

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Before you get into the teachers' office.You must knock( )the door.A.on B.in C.to

2022-10-04 19:51:20 21次反馈错误加入收藏正确率 : 100%

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Before you get into the teachers' office.You must knock( )the door.A.on B.in C.to

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