语法与词汇
15.
Once______, this power station will supply all the neighbouring towns and villages with electricity.
A、
it being completed
B、
completed
C、
it was completed
D、
it completing
【正确答案】
B
【答案解析】
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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