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 cooked the meat for a long time so as to make it ______ enough to eat.
A．mild
B．slight
C．light
D．tender
单项选择题
If this kind of fish becomes ______, future generations may never taste it at all.
A．minimum
B．short
C．seldom
D．scarce
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