I like listening to music ___makes me relaxed.填that,which 还是不填?为什么?

问题描述:

I like listening to music ___makes me relaxed.填that,which 还是不填?为什么?

此处which/that都可以,指代前面I like listening to music这件事,
必须填,此处缺少的就是从句的主语~