问题描述: 用适当的介词填空. Jim likes Chinese very much,and he always works hard___it 1个回答 分类:英语 2014-11-14 问题解答: 我来补答 on 或者at 都可以的.work on ...是"着手做某事...",work at是"在...方面做" 展开全文阅读