问题描述： i heard lucy sing just now 变被动语态 1个回答 分类：英语 2014-10-05 问题解答： 我来补答 答案是Lucy was heard to sing just now. 解析;hear sb do sth这里是省略to 的不定式变为被动语态是to 不可省 展开全文阅读
