【俊狼猎英】团队解答如下：
这是个简略的倒装句=I will never know what was on his mind at the time,and anyone else won't konw ,either.=I will never know what was on his mind at the time,nor / neither will anyone else.
anyone是包括"I"的,如果用anyone,意思上就重复了.anyone else 是除了“I”,其它任何人也不会.这样才对.