问题描述: what's five and four? it's nine. 还是this is nine. 为什么? 1个回答 分类:英语 2014-10-03 问题解答: 我来补答 it's nine 翻译成中文,4+5=? 是9,所以用it‘s 不用this is 来强调, 展开全文阅读