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 disappearance of her paper has never been ______.
A. counted for
B. looked up
C. accounted for
D. checked up
单项选择题
The two scholars worked at the task of writing a preface to the new dictionary for three hours ______ last night.
A. at length
B. in full
C. on end
D. in time
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