Here is a survey about hopes and dreams thousands of students took part.
A. at which
B. in which
C. with which
D. about which
网友回答
A. at which
(答案→)B. in which
C. with which
D. about which
解析：句意：这是一个有关希望和梦想的调查表，几千学生参加了这个调查。此处短语take part in意为：参加。这里in被前置。所以选B。