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
— Do you always go to work on foot— Not always.______ it rains, I usually go to work by bus.
A．When
B．While
C．As
单项选择题
The subway train starts and stops quickly. It helps the train______ swiftly between the stations.
A．go
B．going
C．to go
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