问题描述： There's （a sign） on the wall.否定句、一般疑问句、提问 1个回答 分类：英语 2014-10-03 问题解答： 我来补答 否定句 There is not a sign on the wall.一般疑问句 Is there a sign on the wall?提问 What is on the wall? 展开全文阅读
