they're expensive knives.改为单数句
来源：学生作业帮助网 编辑：六六作业网 时间：2024/11/26 09:20:01
they''reexpensiveknives.改为单数句they''reexpensiveknives.改为单数句they''reexpensiveknives.改为单数句Itisanexpensivek
they're expensive knives.改为单数句
they're expensive knives.改为单数句
they're expensive knives.改为单数句
It is an expensive knife.
或者
that is an expensive knife
it is an expensive knife