单项选择题

The noise was caused by a dog______ mouse through the back door.

A．catching
B．fighting
C．following
D．chasing
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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
单项选择题
I find it difficult to believe what he says______he never tells me the truth.
A．so
B．as
C．though
D．while
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