单项选择题

He ought to attend the meeting,______

A. should he
B. ought he
C. shouldn't he
D. oughtn't he
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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
单项选择题
You'd better let me know as soon as there is a(n) ______ position in the branch office.
A. empty
B. vacuum
C. hollow
D. vacant
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