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。whom指代先行词500 local youths，在定语从句里作为of的宾语。句意：奥巴马在访问中国期间给500名当地的年轻人发表了演讲，其中很多人都是来自复旦大学和清华大学。