选D,因为后一半是定语从句.
如果选A,则前后应该是并列分句,分句中间就要加连词and.
请看这三个句子：
John invited about 40 people to his wedding, most of whom are family members.（后半句是定语从句,从句的主语是most of whom,谓语是are.）
John invited about 40 people to his wedding, and most of them are family members.（后半句是并列分句,分句的主语是most of them,谓语是are.）
John invited about 40 people to his wedding, most them being family members.（后半句不是从句,也不是分句,只是一个现在分词短语.因为它没有谓语动词.） 选D,因为后一半是定语从句.
如果选A,则前后应该是并列分句,分句中间就要加连词and.
请看这三个句子：
John invited about 40 people to his wedding, most of whom are family members.（后半句是定语从句,从句的主语是most of whom,谓语是are.）
John invited about 40 people to his wedding, and most of them are family members.（后半句是并列分句,分句的主语是most of them,谓语是are.）
John invited about 40 people to his wedding, most them being family members.（后半句不是从句,也不是分句,只是一个现在分词短语.因为它没有谓语动词.）