单项选择题

When she listens to a talk, she likes to sit______.

A．at front
B．in front
C．in front of
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单项选择题
Tom will finish school ______ six months.
A．in
B．after
C．until
单项选择题
The poor old man died ______ a winter night.
A．on
B．in
C．at
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