问题描述： he was doing his homework yesterday afernoon改为否定述句 1个回答 分类：英语 2014-10-28 问题解答： 我来补答 he wasn't doing his homework yesterday afternoon. 再问： 亲，／还有几个题，可不可以帮帮忙啊 再答： 好呀，你发来看看，一定知无不言～ 展开全文阅读
