问题描述: 请对They're on a holiday.和They're on vocation.进行提问, 1个回答 分类:英语 2014-10-17 问题解答: 我来补答 what are they doing 再问: what do they do ?可以吗? 再答: 不可以 前一个强调现在进行 你的强调经常性 展开全文阅读