during that time about two thousand people went through the station,most of__on their way to work为什么填them ,不填whom.

问题描述:

during that time about two thousand people went through the station,most of__on their way to work
为什么填them ,不填whom.

后一句没有谓语结构说明不是从句而是独立主格结构所以填them 如果改为most of whom were on their way to work 句中有动词,说明是句子按照定语从句特点填关系代词whom.
以下两面三刀个例子你会明白
All the students are sitting in the classroom, some of them busy with their composition.
All the students are sitting in the classroom ,some of whom are busy with their composition.

后面不是一个从句,而是独立主格结构,故不能用whom,而用them.