问题描述: I haven't decided which train I should take.(用动词不定式改写句子)顺便解释一下什么是动词不定式 1个回答 分类:英语 2014-10-11 问题解答: 我来补答 i haven't decided which train to take.动词不定式是to do,to be done,to be doing等结构 展开全文阅读