问题描述: They ____ jump,swim and sing,too.A.are B.can C.aren't D.can't 1个回答 分类:英语 2014-10-25 问题解答: 我来补答 答案选B.can can后接动词原形,这里是肯定句,所以只有B.can 符合 展开全文阅读