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