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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单项选择题
The children are standing ______ the starting line and are ready ______ run.
A．at, to
B．at, for
C．in, to
单项选择题
______ can fly.
A．Cows
B．Dogs
C．Birds
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