单项选择题

The boy was ______ at maths.

A．free
B．good
C．nice
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单项选择题
Since the ground is wet, it ______ last night.
A．must have rained
B．had rained
C．must rain
单项选择题
When he listens to a talk, he likes to sit ______ .
A．in front
B．at front
C．in front of
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