快高考了.It is said that a polar winter,_____,will stay for more

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快高考了.It is said that a polar winter,_____,will stay for more than six month.
A.once arrives B.once arrived C.once it arrives D.it once arrives
为什么A不行..

Once是连词,在这里引导的条件状语从句作插入语.句意是“据说极地的冬天一旦到来,将会持续六个月以上”.once和if,when等用法差不多,后面引导的从句若主语和主句的主语一致的时候,可以省略主语（你估计是这一点有点糊涂,所以很疑惑a答案不为什么不行）,但是这种省略主语的情况有前提：当从句是“主语＋系动词”结构,且主语和主句主语一致时,可省略主语和系动词,只剩下名词、不定式、形容词（短语）、介词短语或分词. 呵呵我说的够仔细吧,希望可以帮到你哦.

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