问题描述： Some ducks are swimming in the pond对some ducks进行划线部分提问 1个回答 分类：英语 2014-11-13 问题解答： 我来补答 What is swimming in the pond? 单独用what/who提问做句子主语时,谓语动词只用单数.再如：They are on duty today.如果对they划线提问,答案是：Who is on duty today? 再问： Jone is swimming in the pond 再答： 是对Jone划线提问吧？ 答案是：Who is swimming in the pond? 展开全文阅读
