第27题: [单项选择]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 参考答案:C 答案解析:【句意】 这座电站一建成竣工,就将向周围城乡供电。
【难点】 once在这里是连词,意为“一旦…就…”,后面省略了it is。