单项选择题

______is worth doing at all is worth doing well.

A. That
B. Which
C. Whatever
D. Those
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单项选择题
He’s an intelligent boy. He______made such a foolish mistake.
A. can’t have

B. may not have
C. might not have

D. mustn’t have
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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