单项选择题

Since the ground is wet, it ______ last night.

A．must have rained
B．had rained
C．must rain
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When he listens to a talk, he likes to sit ______ .
A．in front
B．at front
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The children are standing ______ the starting line and are ready ______ run.
A．at, to
B．at, for
C．in, to
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