单项选择题

Cats sleep________day and hunt________night.

A．in, in
B．at, at
C．during, during
D．by, by
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单项选择题
It was not an easy job for the police to find out the murderer, because no________had been found yet.
A．hint
B．clue
C．trace
D．track
单项选择题
_______is often the case, the girl forgot to bring her dictionary.
A．As
B．Such
C．That
D．It
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