问题描述: This is a backpack.(对.backpack提问) 1个回答 分类:英语 2014-10-15 问题解答: 我来补答 What is this?或What's this?因为backpack是物,所以用what提问根据英语中疑问句的语序:特殊疑问词+be动词+代词?可得出What is this? 展开全文阅读