I know some of them 中为什么要用them?

some of them 为什么要用them? I know some of them,but I do not kow---of them 英语句子成分问题 I only know some of them. I don't know _____ of them. A.any B. some C. no 选什么,为什么? I don't know __ of them,I only know some.A.everyone B.every some of them怎么用 Both of them study very hard.为什么要用them? I don't know them.为什么接宾格them i don't know all of them " I know none of them" means "-----------------" I do not know any of them? I don't know any of them