单项选择题

Knock at the door before you______ the room.

A． enter into
B． come in
C． enter
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单项选择题
I know Jack quite well. I have seen him______ from childhood.
A． grew up
B． growing up
C． grow up
单项选择题
The boys had______ playing the football game.
A． a good time
B． good time
C． good times
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