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
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
单项选择题
（）that my head had cleared, my brain was also beginning to work much better.

A．For
B．Now
C．Since
D．Despite
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