Once _______, this power station will supply all the neighboring towns and villa

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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

解析条件状语从句的省略形式。once在这里是连词，意为“一旦……就……”。当状语从句主语和主句主语一致且状语从句有be动词时，可将状语从句的主语连同be一同省略。由于power station与complete之间存在被动关系，故选C，其中省略了it is。

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