The book, is green, has been lent to my brother.
A. of which cover
B. the cover of which
C. whose covers
D. its cover
网友回答
A. of which cover
(答案→)B. the cover of which
C. whose covers
D. its cover
解析：考查定语从句。定语从句the cover of which is green修饰先行词The book；A应该改为of which the cover; C应该改为whose cover; D应该改为whose cover;