单项选择题

The workers ______ the telephone in my new house yesterday.

A．called
B．set up
C．opened
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单项选择题
There are quite a lot of differences ______ the old and the young.
A．among
B．in
C．between
单项选择题
He has such a busy life ______ he always forgets my birthday.
A．when
B．if
C．that
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