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
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_______is often the case, the girl forgot to bring her dictionary.
A．As
B．Such
C．That
D．It
单项选择题
The cloth is________.
A．as blue as green
B．bluer than green
C．more blue than green
D．so blue as green
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