once ______, this power station will supply all the neighboring towns and villages with electricity.
Ait being completed
it completed
completed
it completes
答案及解析: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。



