Once______, this power station will supply all the neighbouring towns and villages with electricity.

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问题 Once______, this power station will supply all the neighbouring towns and villages with electricity.

选项 A、it being completed
B、completed
C、it was completed
D、it completing

答案B

解析 句意:一旦建成,这座电站将会给附近所有城镇供电。主句的主语和从句的主语一致,并且从句的谓语动词为be动词时,从句的主语和谓语动词可以省略。
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