问题
选择题
Barack Obama delivered a speech to 500 local youths during his visit to China, many of _______ were from Fudan University and Tongji University.
A．them
B．whom
C．which
D．those
答案
答案：B
考查定语从句。根据先行词500 local youths可知当前面有介词是指人的引导词只能使用whom，故选B。