In our factory there are 2,000 workers,two thirds of ____are women.

题目

In our factory there are 2,000 workers,two thirds of ____are women.
In our factory there are 2,000 workers,two thirds of ____are women.
A.them B.which C.whom D.who
我知道答案是C,请问为什么A不行啊?求详解.

答案

如果选them,那句子就成了两个句子了.in our factory there are 2000 workers.是一句.Two thirds (of them) are women.又是一句.一个句号不能出现两个句子.
whom 是指示代词,指代2,000 workers