He has two sons,__________ work as chemists.为什么选C

He has two sons,__________ work as chemists. He has two sons,both of whom work as chemists. he has 2 sons,___work as chemists. he has two sons,( )work as doctors.Aboth of which Bboth of w he has two sons who ____in the same company 为什么用work 不用works He has two sons,____ works as a chemist. He has two sons；both of （）Walk as chemicals.括号中 he has two sons,one of them works as a teacher 那里语法错误 He has two sons,who in the same company He has two sons who He has two sons,both of whom are teachers.和He has two sons b He has two sons,one______is doctor.A.OF them B.of that C.of He has two sons,and ( ) are collage students.