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

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

选项 A、it being completed
B、it completed
C、completed
D、it completes

答案C

解析 once在这里是连词,意为“一旦…就…”,后面省略了it is。
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