The girl _______got sick at school today was taken to hospital.这里的关系代词为什么只能用who而不能用that?

问题描述:

The girl _______got sick at school today was taken to hospital.这里的关系代词为什么只能用who而不能用that?

选who 的原因是 who 是对人用的代词,
不过,近来用 that 代替 who 和 which 已被公认为可以接受 - 尤其是口语.(虽然老师可能不同意).