问题描述: He has been worked hard ___his lessons.用at还是in啊? 1个回答 分类:英语 2014-09-27 问题解答: 我来补答 at work hard at努力工作(学习) I always work hard at English,so I hardly ever fail in the exam.我总是努力学习英语,所以在考试中我几乎没有失败过. 展开全文阅读