问题描述: the students are used __(sing) a song at the beginning of the class.用所给词的正确形式填空 1个回答 分类:英语 2014-10-22 问题解答: 我来补答 to singingbe used to doing 习惯于做某事很高兴为你解答!请及时采纳哦!多谢你的问题! 展开全文阅读