How much have you raised for the children who come from the big mountains?

问题描述:

How much have you raised for the children who come from the big mountains?
这句话中的"who"是什么意思?为什么要有它?如果没有它,这句话还正确吗?

这里的who是定语从句的引导词,去掉who句子是错误的.