There are altogether eleven books on the shelf, ________ five are mine.
A.on which
B.in which
C.of which
D.from which
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C解析思路分析：本题考查定语从句的用法。要选择正确的介词，首先应确定定语从句的先行词是eleven books，再看它和定语从句的关系是five of eleven books are mine，of which five=five of which，表示“其中的5本”。句意：“书架上有十一本书，其中五本是我的。”