单项选择题

56（）

A．at
B．with
C．for
D．off

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They are going to have the serviceman to be installed an electric fan in the office tomorrow.
A．are going to
B． have
C．to be installed
D．in
单项选择题
People appreciate to have worked with him because he has a good sense of humor.
A．to have worked
B．because
C． a good sense
D．humor
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