高校问答国外流量贵吗:~~关于过去完成时的一个小问题~~
来源：百度文库 编辑：高校问答 时间：2024/04/25 08:22:50
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