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
A．monthsB．weeksC．hoursD．times
A．months
B．weeks
C．hours
D．times
单项选择题
A．demonstratedB．composedC．hostedD．formed
A．demonstrated
B．composed
C．hosted
D．formed
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