___I left school he had taugh our class for two year.A.Whenever B.The moment C.BY the time如何选,

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___I left school he had taugh our class for two year.A.Whenever B.The moment C.BY the time如何选,
___I left school he had taugh our class for two year.A.Whenever B.The moment C.BY the time
如何选,

___I left school he had taugh our class for two year.A.Whenever B.The moment C.BY the time如何选,
答案选C.By the time
By the time 到…时候为止
通常引导一个时间状语从句,表示“到……的时候为止”主句则表示在此时间之前某个事件已完成.值得注意的是,当从句用过去时时,主句通常用过去完成时.即过去的过去.
since用于现在完成时

选C。把其他两个选项放入句中,也说不通的。

C
主句为过去完成时,本句需一个体现“过去的过去”的时间状语。

C、By the time,过去完成时。
到我离开学校的时候,他已经教我们2年了。

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