Question

. There are altogether eleven books on the shelf, _____ five are mine.
A. on which         B. in which     C. of which          C. from which

Answer 1

C

考查定语从句。句意：书架上一共有十一本书，他们中的五本是我的。结合语境可是我的五本和前面十一本是主从关系，故介词用of……的。选C。