应该说是多用which吧..具体的
非限定性定语从句：非限定性定语从句的作用是对所修饰的成分作进一步说明,通常和主句间用逗号隔开,将从句拿掉后其他部分仍可成立
1. which引导的非限定性定语从句来说明前面整个句子的情况或主句的某一部分 ,that不能用于引导非限制性定语从句
例如:
Her house,which was built a hundred years ago,stood still in the earthquake.(那座房子在地震中依然耸立,它是一百多年前建造的.)
3. 有时as也可用作关系代词
4. 在非限定性定语从句中,用who, whom代表人,用which代表事物.
5.当先行词是专有名词或物主代词和指示代词所修饰时,其后的定语从句通常是非限制性的.
例如：
Charles Smith, who was my former teacher, retired last year. 查理·史密斯去年退休了,他曾经是我的老师.
My house, which I bought last year, has got a lovely garden. 我去年买的的那幢房子带着个漂亮的花园.
This novel, which I have read three times, is very touching. 这本小说很动人,我已经读了三遍.
6.非限制性定语从句还能将整个主句作为先行词, 对其进行修饰, 这时从句谓语动词要用第三人称单数,
例如：
He seems not to have grasped what I meant, which greatly upsets me. 他似乎没抓住我的意思,这使我心烦.
Liquid water changes to vapor, which is called evaporation. 液态水变为蒸汽,这就叫做蒸发.
非限制性定语从句只是对主句内容,或先行词的补充、解释或附加说明.主句与先行词或从句之间一般用逗号分开,常常单独翻译.没有它,主句意思仍然完整.引导非限制性定语从句的关系代词有as,which,who, whom,whose等,作定语从句的主语、宾语、表语及定语.关系副词有when,where等,作定语从句的状语.关系代词和关系副词在定语从句中一般不能省.
你看看这个..很不错的
http://baike.baidu.com/view/576409.html?wtp=tt