She is the only person who understands me还是that understands me

问题描述:

She is the only person who understands me还是that understands me
the only不影响关系代词的选择吗?

这是定语从句的问题,
如果先行词前有 the only,那么,关系代词肯定用that
肯定!
如果有*,亦如此