关于of whom与whoI have many friends,_____some are businessmenA.who B.of whom 选什么?为什么?,of whom 可不可以作主语,老搞不清它的用法

关于of whom与whoI have many friends,_____some are businessmenA.who B.of whom 选什么?为什么?,of whom 可不可以作主语,老搞不清它的用法 翻译：I have twosisters,both of whom are doctors. We have three children,none of whom are abroad.为什么用whom而不用who. 关于who与whom的用法That can occur only when there are at least two parties ,each of whom has something to offer.请问,为什么用whom而不是who,这里应该是作主语啊?请赐教! They have four children,three of whom live abroad为什么是three of whom 而不是three of them In his office there are nince clerks,——————is Mr Wang 选择A the youngest of whom B the youngest of themthe youngest one that the youngest whoI don't know how it happend,because i was out of town____A at a time B at the same time C at th I have many friends of whom some are businessmen.of whom 是做从句宾语吗?怎么还原 this is the most interesting film which/that/whoI have ever seen说明选择原因 十万火急：many of whom have walked a long way为什么前面用whom ,而不是who怎么后面是宾语 I have many friends, the tallest of whom is wei fang. 这个当中的whom可以换代词 them吗? I have many friends,__________some are businessmen.为什么填of whom而不是of them呢, i have two brothers,both_are doctors.为啥不用BOTH OF THEM非要用BOTH OF WHOM I have many friends,__________some are businessmen.为什么要填of whom 而不是of them I have three brothers ,( )are in Beijing.A.no one of whom B.neither of them C.some of them D.none of whom these days i have been through a lot of bad things.they remains me of u.u r the only one person whoi am not intended to interrupt ur current happy life.just tell u i thank u.and god bless u.these days i have been through a lot of bad things.they rema I have many friends,of whom some are painters.可否表达为I have many friends,some of whom are painters. many of whom,A great number of historians have written about him and given an insight into his time,many of (whom)?have achieved remarkable results.whom 还是them 定语从句I have many friends,( )some are businessmen 括号中填什么?为什么?of them from whom who of of whom 四个选项