once ----,this power station will supply all the neighboring towns and villages with electricity.A.it being completed B,it completed C.it was completed D.it completing为什么选B而不选A呢?

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once ----,this power station will supply all the neighboring towns and villages with electricity.A.it being completed B,it completed C.it was completed D.it completing为什么选B而不选A呢?
once ----,this power station will supply all the neighboring towns and villages with electricity.
A.it being completed B,it completed C.it was completed D.it completing
为什么选B而不选A呢?

once ----,this power station will supply all the neighboring towns and villages with electricity.A.it being completed B,it completed C.it was completed D.it completing为什么选B而不选A呢?
being completed指某事物正在被完成.
completed是已经完成.
句子的意思是说只有完成了某样东西,发电站才能供应电能.

will将来时，前面就应该用一般现在时，而A为进行时

just this once no Once,this is a promise Once ____,this power station will supply all the neighboring towns and villages with electricityA.it being completed B,it completed C.completed D.it completing为什么选C而不选B呢? once ----,this power station will supply all the neighboring towns and villages with electricity.A.it being completed B,it completed C.it was completed D.it completing为什么选B而不选A呢? 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说明原因 power power power power power power power power power power power power 帮忙翻译下这句 please manually power up this phone