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我母亲去年回中国的时候已经持有绿卡，她在中国呆了5个月后返美。 但她返回美国时没有把绿卡给海关的人看， 结果护照上给盖了6个月的期限（当时她护照有十年有效签证）。 请问， 这对她下次回中国有没有什么影响？

-This is a serious mistake which may have resulted in her green card invalid because she used the B-2 visa to enter US, not the green card. Is she currently physical present in US? If yes, she needs to go to the local CBP Deferred Inspection Office as soon as possible to see whether it can be fixed. Find the local CBP Office in your area at this link:

https://www.cbp.gov/sites/default/files/assets/documents/2016-Nov/deferred_inspection_sites_110316_2.pdf

需要做什么补救措施吗？ 谢谢老师！