单项选择题

______ at the door before you come into the room.

A．Hit
B．Knock
C．Touch
D．Strike
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单项选择题
Don't risk ______ the job which so many people want.
A．losing
B．to lose
C．lost
D．your life to lose
单项选择题
He got up to the roof ______ a ladder.
A．by all means
B．by any means
C．by means of
D．by no means
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