语法填空,定语从句一道题

问题描述:

语法填空,定语从句一道题
“We're going to talk to someone______really knows what is going on.
答案给的who,我想问的是填that可以吗?

先行词是人,可用who / that ,这里是作主语,可以用that ,但一般都是用WHO