一道关于定语从句的题目 Here are basketball from the United States,some of___are our old friends.
问题描述：
一道关于定语从句的题目 Here are basketball from the United States,some of___are our old friends.
我想知道能不能填which或who,还有为什么填这两个.
答
能填which,但不能填who或that
因为是在介词后.介词后面的关系代词不是which 就是whom