表语从句中what与who的用法有啥区别?急

问题描述:

表语从句中what与who的用法有啥区别?急
He is ____is known as a hacker- he likes to show off on the Internet and attack websites.
此处应该是what还是who?

what .用单句表示从句的意思时应该用什么提问就用什么词.如你这句就是what do you do.