单项选择题

They are going to have the serviceman ______ an electric fan in the office tomorrow.

A．install
B．to install
C．to be installed
D．installed
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单项选择题
She was complaining that the doctor was ______ too much for the treatment he was giving her.
A．expending
B．offering
C．costing
D．charging
单项选择题
Living in the central Australian desert has its problems, ______ obtaining water is not the least.
A．for which
B．to which
C．of which
D．in which
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