问题描述： do your homework by yourself 为啥用by啊 望讲解, 1个回答 分类：英语 2014-11-29 问题解答： 我来补答 很高兴为你解答.Do your homework by yourself自己独立完成作业by oneself = on one's own 靠自己,为固定搭配.祝开心~o(∩_∩)o 哈哈~ 展开全文阅读
