单项选择题

The workers were paid ______ in this factory.

A. by an hour
B. by hour
C. by the hour
D. by hours
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You look very well after your holiday; you have ______ weight.
A. put on
B. put up with
C. put away
D. put out
单项选择题
The noise was caused by a dog ______ a mouse through the back door.
A. catching
B. fighting
C. following
D. chasing
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