过去完成时标志词 五个
问题描述：
过去完成时标志词 五个
答
1.beforeI thought I had sent the letter a week before.2.by By nine o’clock last night,we had got 200 pictures from the spaceship.3.过去完成时常常用在told,said,knew,heard,thought等动词后的宾语从句（或...