定语从句that什么时候可以替换who/which/whom

定语从句that什么时候可以替换who/which/whom 定语从句什么时候用that which whose who whom 定语从句中什么时候用that which whom who 总之有什么区别? 英语定语从句中怎样用who,whom,whose,that,which? 在定语从句中,that,which,,who,whom,怎么用 关于定语从句who,whom,that which.的用法 何时定语从句that不能替代who,which,whom.whose 请问定语从句who/whom 和that/which 怎么区分? 定语从句中的who,whom,which,that,what,it,as,怎么用,总是分不清什么时候用哪个 定语从句中that是否可以代替who与whom who,that,which,whom哪一个可以充从句中的主语 用定语从句：that whik who whom when where why as 介词+which 介词+whom