這是定語從句中關(guān)系詞作介詞賓語的現(xiàn)象,在原句中which 做的是from 的賓語.
先把原句拆成主句和從句,就會變成：
1.she had run back in the direction.
2.from which she had come.再把from which 放到適當(dāng)?shù)奈恢蒙暇蜁某桑簊he had come from which.而關(guān)系代詞which指代的就是前面先行詞 the direction,于是第二句話就會改成she had come from the direction .了.這樣答案就一目了然了.