神马品牌网农村别墅建筑成本:~~关于过去完成时的一个小问题~~
来源：百度文库 编辑：神马品牌网 时间：2024/07/05 20:33:40
when 可不可以用在过去完成时里面？Why?
By the time I came in the classroom, they had already cleaned the classroom. 句中的by the time 能否用when代替？？？
谢谢！
Thank you for your answers!!!
By the time I came in the classroom, they had already cleaned the classroom. 句中的by the time 能否用when代替？？？
谢谢！
Thank you for your answers!!!
可以的!
可以