单项选择题

It is necessary that he ______ back without delay.

A．comes
B．came
C．come
D．would come
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单项选择题
I've heard him ______ many times.
A．criticizing
B．criticized
C．criticizes
D．to criticize
单项选择题
He has a ______ habit of biting his lips when he is puzzled.
A．peculiar
B．special
C．specific
D．particular
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