英语定语从句中什么情况下只用that,不用which?又在什么情况下只用which...答:(2)当先行词是all, everything, something, nothing等不定代词,或被first, last, only, few, much, some, no, any以及形容词的最高级修饰时,只能用that,不能用which。如:All (that) they needed were qualified workers.This is the most difficult book (that) I have ever read.(3...