问题描述： It is a pen.改为否定句,并作肯定回答.改为一般疑问句,并作否定回答 1个回答 分类：英语 2014-11-10 问题解答： 我来补答 It isn't a pen.Yes,it is.Is it a pen?No,it isn't. 展开全文阅读
