Many of them owned by or affiliated with national broadcasters.请问_英语解答

Many of them owned by or affiliated with national broadcasters.请问此处them为什么不能用which代替?

人气：213 ℃　时间：2019-11-12 06:02:16

解答

若在同一句话中,前面提到了them指代的名词,逗号后面的一句再次引用,可以用which指代.
这里显然是另起一句,不能用which指代上一句中的某一名词