问题
选择题
He made three good friends in the university, ______ joined the army after graduation.
A．one of them
B．one of whom
C．one
D．one of which
答案
答案：B
考查定语从句。句意：他在大学里面交了三个好朋友，其中之一毕业后参了军。本句先行词three good friends下文逻辑主语，作介词宾语的指人的引导词只能使用whom，故用选B。