问题描述： 用 do sth by doing sth和do sth by mistake 造句 1个回答 分类：英语 2014-12-15 问题解答： 我来补答 The man helped her by picking up her bag.那人帮她捡起了包.I took my brother's pen by mistake.我不小心错拿了我哥哥的钢笔. 展开全文阅读
