she had run back in the direction from which she had come为何不能改为she had run back in the direction inhich she had come

这是定语从句中关系词作介词宾语的现象,在原句中which 做的是from 的宾语.
先把原句拆成主句和从句,就会变成：
1.she had run back in the direction.
2.from which she had come.再把from which 放到适当的位置上就会改成：she had come from which.而关系代词which指代的就是前面先行词 the direction,于是第二句话就会改成she had come from the direction .了.这样答案就一目了然了.