问题描述: Lessons start at nine o' clock 改为一般疑问句和否定句 1个回答 分类:英语 2014-10-02 问题解答: 我来补答 ...刚帮你回答了一个,你在做作业么,干脆加我QQ,我直接告诉你得了...疑:Do lessons start at nine o'clock?否:Lessons don't start at nine o'clock. 展开全文阅读