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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单项选择题
Tom had prepared carefully for his English examination so that he could be sure of passing it on his first ______ .
A．intention
B．attempt
C．purpose
D．desire
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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