问题
选择题
She brought with her three friends, none of _________ I had ever met before.
A．them
B．who
C．these
D．whom
答案
答案：D
题目分析：考查非限制性定语从句。根据逗号可知，是非限制性定语从句，A、C不能引导定语从句，排除A、C；介词of后加which指物，加whom指人，先行词是three friends，故选D。