好吧句子未完整。。
整句是Those ____ not only from books but also through practice will succeed.
——those指人的时候，后面的定语从句要用who引导，不用that。追问
Why?。。。求举例
追答Those (people) who = They/People who = Such (people) as + 复数动词：意为“凡是…的人们”。
这是 those who 的复数句型，但亦也可以用下面的单数句型来表达相同的意思：
He/One who = Anyone who = Whoever + 单数动词：意为“凡是…的人”。请看下面的例句：
Those who have money do not want for friends. (凡是有钱的人都不会缺乏朋友)
= Such as have money do not want for friends. (在这句中，as是关系代词)
= He who has money does not want for friends.
= Whoever has money does not want for friends. (Whoever = Anyone who)
下面两句分别是 those who (主格) 的宾格 those whom 和所有格 those whose的应用：
No distance can sever those whom the fate unites. (有缘千里来相会)
Almighty Heaven is not indifferent to those whose hearts are earnest. (苍天不负苦心人)
those我认为指的是知识，who是泛指
我觉得这句话的中文解释是：他们学习的知识不仅是从书本中得来，也有实践中得来的。追问
句子我忘了写完整了。。。。再看下！谢！！
追答这次可以肯定是who
哥们儿，这个英文的一般习惯是从句中指代人的时候一般用who，记住就好
就像很多外国人搞不懂中国的语法一样，不必刻意的去追求原因
因为those指代的是人，所以用who learn.追问
that为何不可？
望采纳~追问
其实答案是who。。。我在纠结为什么that不行
why？
追答who 作主语 thoes 作learn的宾语
