Most of those arrested are young people, some of_________are members of a radical group calling itself the " National Independent Party".
A、 who
B、 which
C、 them
D、 whom
【正确答案】：D
【题目解析】：此题考查的是关系分句。逗号后面的分句为非限制性定语分句，修饰的是人，但是在分句中先行词作介词of的宾语,所以要用宾格形式，整个some of whom作分句的主语。
