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
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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
单项选择题
The heating system in the hotel is very advanced, and its temperature can be controlled ____________.
A．automatically
B．artificially
C．manually
D．economically
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