作业帮they're expensive knives.改为单数句
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/02 15:33:38
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
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来源：学生作业帮助网 编辑：作业帮 时间：2024/05/02 15:33:38
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