问题描述: you need __(do )it again 1个回答 分类:英语 2014-09-24 问题解答: 我来补答 need是情态动词,后面接不定式to do sth.You need to do it again.像must,needn't等都是情态动词,后面都接不定式to do sth. 展开全文阅读