单项选择题

I've heard him ______ many times.

A．criticizing
B．criticized
C．criticizes
D．to criticize
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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
单项选择题
The mother didn't know ______ to blame for the broken glass as it happened while she was out.
A．who
B．when
C．how
D．what
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