8老师，中秋快乐！
非常感谢您的回复。我还要请教的问题是，如果我再次向移民局寄出了I-751的申请材料以后，我却收到了前一次I751申请的receipt notice，这时候会发生什么？该怎么办？
-Then, USCIS may feel confused and result in some kind of mistake. So, you had better make sure USCIS did not receive your first application before you file a new one.
