单项选择题

There are quite a lot of differences ______ the old and the young.

A．among
B．in
C．between
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单项选择题
Don't speak to her. She ______ to the weather report.
A．listens
B．is listening
C．has listened
单项选择题
Mary was ______ abroad by her company.
A．to send
B．sending
C．sent
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