He has two sons,__________ work as chemists.A.two of whom B.both of whom C.both of whoD.all of whomC为什么不可以选择

He has two sons,____ works as a chemist.A.both of them B.two of whom C.neither of whom D none of them讲解一下, 谁能帮我具体介绍一下twin这个词的用法 比如He has two ____ sons（双胞胎）一词怎样填 1 .He has two sons.Both of 应该填whom还是who are teachers .2.He has two sons,both of 应填whom还是who are teachers. He has two sons,who in the same company He has two sons who in the same company这俩个句子有什么区别 He has two sons,who in the same company He has two sons who in the same company这俩个句子有什么区别 英语翻译He has two sons,___is a doctor,____is a teacher He has two sons,both of whom work as chemists.这里的as做什么成分? He has two sons.One son is a doctor .The other son is a teacher He has two sons, ( )of them lives with him. A .each B.neither C.either he has two sons and both are teachers这句话对吗? Mr.White has two sons ,and each of them has a sister.how many childen does he have? Alice has two sons.is Tim and is Tim.A.One,the other B.One,one C.He,he He has two sons,both of whom are teachers.和He has two sons both of them are teachers.第二句中没有and ,是不是对的?第一句的语法讲下, He has two sons,and ( ) are collage students.为什么能用both of them,and前后可以用两个主语么如果是he has two sons,___are college students.逗号前后只能有一个主语， He has two sons,both of whom are workers.此句中whom可以换成them吗? He has two sons,both of whom are workers.此句中whom可以换成who和which吗... He has two sons,one______is doctor.A.OF them B.of that C.of which应该选哪个?为什么呢? he has two sons,one of them works as a teacher 那里语法错误那把one改成both对吗，