Question

If she could succeed, she would be the first person in the world who did it.

这是道中考题，但是我觉得不应该用who，因为先行词有序数词修饰，只能用that吧。
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Answer 1

回答如下
你说的这条只在先行词是物时区分用that还是which时适用，先行词是人就是who。

追答

先行词是序数词/最高级形容词时，或先行词被序数词，最高级形容词修饰时，要用that而不是which

This is the first/best film that I have seen since I came here.

当然，如果先行词同时包括人和物时，也要用that。

They often talk about the people and the things that they like most.