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（请给出正确答案）
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
B.it completed
C.completeD.D.it completes
参考答案
参考解析
解析：本题考查省略句
C选项，句意：这座电站一旦建成竣工，就将向周围城乡供电。once在这里是连词，意为“一旦…就…”，后面省略了it is。
A，选项，没有省略it，使用排除法，故排除。
B，选项，没有省略it，使用排除法，故排除。
D，选项，没有省略it，使用排除法，故排除。
故正确答案为C选项。
C选项，句意：这座电站一旦建成竣工，就将向周围城乡供电。once在这里是连词，意为“一旦…就…”，后面省略了it is。
A，选项，没有省略it，使用排除法，故排除。
B，选项，没有省略it，使用排除法，故排除。
D，选项，没有省略it，使用排除法，故排除。
故正确答案为C选项。
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