定语从句在什么情况下不能用that只能用which答:都只能用that a)在不定代词,如:anything,nothing,everything,all,much,few,any,little等作先行词时,只用that,不用which.All that is needed is a supply of oil.Finally,the thief handed everything that he had stolen to the police.b)先行词有the only,the very,the just修饰时,只用that....