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

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