This is a survey about dreams,in which thousands of students across China took part in这里的in which 的先行词是哪个 ,句子
问题描述：
This is a survey about dreams,in which thousands of students across China took part in
这里的in which 的先行词是哪个 ,
句子
答
survey
从句中的主*分是,students took part in,也就是“学生参与的”
参与的是调查,而不是梦