高一单项选择whose is the book____ the cover is blue?

高一单项选择whose is the book____ the cover is blue?
whose is the book____ the cover is blue?
A whose
B its
C which
D of which
求最准确的解释
（若用排除法请说明每一个被排除的最准确地理由）
因为要做纠错本

我想你应该就是在A和D之间徘徊吧.
Whose=of which the
这句话翻译成书皮是蓝色的这本书是谁的.
在这里是定语从句,指代the book,用of which 即可.
如果用whose,则应该删去后面的the.因为whose作为连词,后面只能接没有任何修饰的名词,就像its cover 就可以表达“它的书皮”,而不用“its the cover”一样.排除A
这是定于从句,需要连词,不能用its,即使用its,也必须在前面加逗号,并且去掉the.解释同前面,排除B.
the cover is blue ,已经是一个完整句子,不缺任何成分,很显然which不适合,如果用which做连接词,它必须在从句中充当成分.排除C.
答案为D,of which the = whose.