单项选择题

Knock______the door before you enter the room.

A. on
B. for
C. at
D. in
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单项选择题
It is no use______over the split milk.
A. to cry
B. crying
C. cry
D. cried
单项选择题
I prefer to live in the countryside rather than______in a city.
A. to live
B. live
C. living
D. lived
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