What she did has nothing to do with us.为什么不用have

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What she did has nothing to do with us.为什么不用have

what-clause 从句作第三人称单数用.

What he did看做一个单数结构的

she did 是定语,修饰what的,与has没有关系!

what 是主语(看作单数),has 是谓语,she did 是修饰what的。
她做什么与我们无关。