问题描述： 将We often hear the girl sing happily in her room改为被动语态 1个回答 分类：英语 2014-11-26 问题解答： 我来补答 The girl is often heard to sing happily in her room .【hear sb do sth 改为被动语态时,do 要变成 to do】再如：He was made to work so long. 展开全文阅读
