I like the dictionary the cover of ___ is red.空格中为什么只用which而不能用that?

I like the dictionary the cover of ___ is red.空格中为什么只用which而不能用that?
I like the dictionary the cover of ___ is red.空格中为什么只用which而不能用that?

I like the dictionary the cover of ___ is red.空格中为什么只用which而不能用that?
因为of是介词,后面只能加which,不能加that,固定用法,介词后只能用which

这里是 Whose 的意思， 但of 是介词， 之后只能用which，不能用that， 语法书上写的很明确: whose = of which 指物， whose= of whom 指人，在这句句子里是dictionary， 指物，所以这里用 of which