Question

She lived in the house ______ she used to live.

where？为什么？？

Answer 1

这是个定语从句，原句意思是“她住在过去她曾经住过的地方”
主句先行词为名词house
从句引导词，即关系副词为where后是整个从句做house的定语。
这里live是不及物动词，where sb live表示的意思是某人居住的地点，where在从句中，做了live的状语，相当于sb live where.
如果用关系代词的话，不及物动词live后，需要加入介词in,组成及物动词短语 live in
这样，原句就成了:
She lived in the house in which she used to live
=She lived in the house which she used to live in
而不能直接用关系代词which ，这里关系代词which相当于做了live in的宾语，没有in的话，单纯的live 后不能接宾语。

Answer 2

in which or where

追问

可是有in the house 啊

追答

要看后面的句子 ______ she used to live. live是个不及物动词 所以要加介词in which 或者直接加状语where

Answer 3

地点状语从句只能用 where / in which