单项选择题

They can't help ______ when they saw the clown.

A．laugh
B．laughing
C．to laugh
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There are quite a lot of differences ______ the old and the young.
A．among
B．in
C．between
单项选择题
Don't speak to her. She ______ to the weather report.
A．listens
B．is listening
C．has listened
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