问题补充:
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
答案:
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;