如何区别宾语从句中that,which,who,whom,if,whether的用法?答:There are fifty-five students in our class , all of whom are working hard . There are five continents in the world , the largest of which is Asia . 4、 as, which 引导非限定性定语从句的差别: 由as, which 引导的非限定性定语从句,as和which可代整个主句,相当于and this或and that。As一般...