单项选择题

Since the matter was extremely ______, we dealt with it immediately.

A．tough
B．tense
C．urgent
D．instant
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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
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
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