问题描述: The windows of the room___(clean) once a week,so they are a little dirty 1个回答 分类:英语 2014-11-14 问题解答: 我来补答 are cleaned这里要用被动语态,意思是:这间房间的窗户一星期打扫一次,所以有一点点脏. 展开全文阅读