In 1908 Lord Northcliffe Offered a prize of one thousand pounds to thefirst man who would fly across the english channel.本句中,who引导的定语从句,修饰先行词man,但先行词被序数词修饰,根据大家定语从句的语法原则,从句中的指示代词应替换为that,为何本句中用who呢?
序数词+名词+关系代词,假如先行词是事物,一般用that不需要which。但假如先行词指人则用that和who都是可以的。