Simone在定语从句中，the only one 后面是用that还是用
的有关信息介绍如下：
用that定语从句中只能用that 的情况：1)先行词是不定代词：all,few,little,much,something,nothing,anything等.All that we have to do is to practise every day.2)先行词被序数词或形容词最高级所修饰.The first lesson that I learned will never be forgotten.3)先行词被all,any,every,each,few,little,no,some,等修饰.I have read all the book (that) you gave me.4)先行词被 the only,the very,the same,the last 修饰时.He is the only person that I want to talk to.5)先行词既有人又有物时.They talked of things and persons that they remembered in the school.先行词是表示地点时,要根据从句的谓语动词是及物的还是不及物的.如果是及物的就用that(which),否则用where.This is the house where he lived last year.This is the house that (which) he visited last year.
