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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单项选择题
The manager spoke highly of such ______ as loyalty, courage and truthfulness shown by his employees.
A．virtue
B．features
C．properties
D．characteristics
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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