高考英语语法：that与who的用法区别
1. 两者均可指人，有时可互换。如：
All that [who] heard him were delighted. 所有听了他讲话的人都很高兴。
Have you met anybody that [who] has been to Paris? 你遇见过到过巴黎的人吗?
He is the only one among us that [who] knows Russian.他是我们中间懂俄语的人。
2. 但是在下列情况，通常要用 that：
①当先行词是一个既指人又指物的并列词组时。如：
I made a speech on the men and things that I had seen abroad. 我就我在国外所见到的人和事作了报告。
②当先行词是who时(为避免重复)。如：
Who was it that won the World Cup in 1982? 谁赢得了1982年的世界杯？
③当关系代词在定语从句中作表语时(可省略)。如：
Tom is not the boy (that) he was. 汤姆这孩子已不是以前那个样子了