What do you think 后面可以接从句,但是what do you think of 后面不可以接从句,因为介词of后面一般接名词或动名词,如
What do you think of our school?
你认为我们的学校怎么样?
What do you think of going hiking?
你认为去远足怎么样?
有不明白的请继续追问,谢谢，那what do you think about 也不能接从句吗？是的，后面不能接从句。