单项选择题

Once ______, this power station will supply all the neighboring towns and villages with electricity.

A. it being completed

B. it completed
C. completed

D. it completes
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单项选择题
The secretary identified ______ reports treated new issues as well as old ones.
A. those
B. which
C. that
D. both
单项选择题
There are means by which the constitution has been______over so long a time to the needs of a changing society.
A. altered
B. changed
C. adapted
D. revised
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