Question

(What he has done has)nothing to do with us. 为啥选括号里的这个，不选What he has done

Answer 1

What he has done是主语从句
has是谓语
nothing （to do with us）是宾语
全句意为：他所做的与我们无关。
注：句中出现的has，前一个是现在完成时的助动词，后一个是实义动词，构成短语
have nothing to do with无关; 与…没关系; 无干; 置身事外
例如
1.You have nothing to do with our family.

你和我们家没有关系了。
2.You certainly have nothing to do with all this.
你当然跟这些无关了。