单项选择题

The policemen arrived in time and caught the thief.

A．Right.
B．Wrong.
C．Doesn't say
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单项选择题
The boys usually helped their teacher after their lessons were over.
A．Right.
B．Wrong.
C．Doesn't say.
单项选择题
A．inB．underC．by
A．in
B．under
C．by
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