单项选择题

It pays ____________ to buy goods of high quality.

A．at the end
B．in conclusion
C．at length
D．in the long run
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单项选择题
I assume the construction of the new airport ____________ at the end of last year.
A．must complete
B．must be completed
C．must have been completed
D．must have completed
单项选择题
The general manager brought ____________ a new reform plan on the personnel system for the company.
A．about
B．down
C．on
D．forward
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