定语从句中先行词that和which什么情况下不能互换?答:在下列情况下只能用THAT引导定语从句1.当先行词是anything, everything, nothing (something 除外), few, all, none, little, some 等代词时,或者是由every, any, all, some, no, little, few, much 等修饰时 2。当先行词被序数词修饰时 The first place that they visited in London was ...