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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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
单项选择题
What is it ______ makes this kind of fish different from other fish
A．what
B．which
C．that
D．in which
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