问题
选择题
. There are altogether eleven books on the shelf, _____ five are mine.
A. on which B. in which C. of which C. from which
答案
答案：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。
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