定语从句中如果先行词被序数词修饰,则需要把who变为that吗?比如说：The first man ______I thought of was Mr Wang.

问题问的好模糊啊~
应该是用which吧
比如:
The second one is better.
I want to know which one is better.
The 3rd picture is mine.
I want to know which picture is yours.

没错,相关语法规定：先行词被序数词,形容词*以及first,last,any,only,few,much,no,some,very等词修饰时,则关系代词一般只用that,而不使用who/which.如：This is the most beautiful lady that I have ever met....