题目内容：

She lived in the house ______ she used to live.
where?为什么?

优质解答

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.