The book,——is blue,is mine

题目

The book,——is blue,is mine
A.the cover of which B.whose cover C.of which the cover D.all the above
为什么选D
麻烦帮我分析一下

答案

the cover of which=the cover of the book
whose cover=the book's cover
of which the cover=of the book,the cover其实就是第一个把of which提前了,都是正确的.