问题描述: it was +since后面跟过去时还是过去完成时 1个回答 分类:英语 2014-10-11 问题解答: 我来补答 it is (has been)+一段时间+since从句since从句要用过去式“自.有多长时间了”it is three years since he died.(自)他去世以来已经三年了 展开全文阅读