It is impossible for a child to lift such a heavy box.这句话中for能改成of吗?why那么It is very nice of you to send my parents your best wishes.这句话中fof能改成for吗?why?到底啥时候用of,啥时候用for?

来源：学生作业帮助网 编辑：作业帮 时间：2024/09/17 08:04:47
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