Mrs.Lee will move to the new house next Mondy,by which time it will be completely finishen.为什么用by which time 而不用by that time?
问题描述：
Mrs.Lee will move to the new house next Mondy,by which time it will be completely finishen.
为什么用by which time 而不用by that time?
答
定语从句，介词后面只能跟which
答
定语从句中,介词是不与that 连用的.在这句话里,by which time 指的是 by next monday,which指代的就是 next monday