【高一英语定语从句Heistheonlyoneofthestudentswhohasbeenawinnerofscholarshipfor3years.中先行词为one,当先行词有theonly来修饰时应该用that,而不是who,这道题为什么用who呀?先行词怎么会是he?如果变】

　　高一英语定语从句

　　Heistheonlyoneofthestudentswhohasbeenawinnerofscholarshipfor3years.中先行词为one,当先行词有theonly来修饰时应该用that,而不是who,这道题为什么用who呀?

　　先行词怎么会是he?如果变为heisoneofthestudentswhohavebeenawinnerof.......中的先行词不就是students吗？所以谓语用have而不是has呀？