高一英语题,有关定语从句Itturnedoutthattheonlypeople____shecoulddependonwerethosewhohadalwaysstoodbyher.答案是who,为什么用who?有theonly修饰的不是只能有that吗?求解

　　高一英语题,有关定语从句

　　Itturnedoutthattheonlypeople____shecoulddependonwerethosewhohadalwaysstoodbyher.

　　答案是who,为什么用who?有theonly修饰的不是只能有that吗?求解