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
They can't help ______ when they saw the clown.
A． laugh
B． laughing
C． to laugh
单项选择题
Tommy is careless; he doesn't remember ______.
A． where his books are
B． where are his books
C． his books are where
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