Some books and a pencil case -------in the bag.A.are B.is C.need D.tack选哪个
问题描述：
Some books and a pencil case -------in the bag.A.are B.is C.need D.tack选哪个
答
A主语为复数，主谓一致
答
选A and连接并列成份…谓语动词用复数
答
A and连接并列主语，谓语动词用复数
答
are
答
A 前后是并列关系,相当于复数用复数形式.