They talked for an hour of things and people __they remembered in the middle shool.

问题描述:

They talked for an hour of things and people __they remembered in the middle shool.
A,which B that C who D whom
为什么是B D 不行么
最好说说 定语从句 时 这几个词的用法区别

因为这是由 that所引导的定语从句.
AC是疑问词 D是宾格形式如果先行词没有 THINGS 只有 PEOPLE可以用whom么?应该可以吧 (注:我不是什么英语高手)