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
The last half of the nineteenth century ______ the steady improvement in the means of travel.
A．has witnessed
B．was witnessed
C．witnessed
D．is witnessed
单项选择题
The extensive survey suggested that their assumptions ______totally wrong.
A．were
B．be
C．was
D．would be
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