找到答案了:不需要A-number

回答: 入籍之後還有Alien Registration Number阿媽屯2016-01-17 11:32:16

http://www.nolo.com/legal-encyclopedia/free-books/fiance-marriage-visa-book/chapter7-8.html

Question 10: A U.S. citizen can put N/A here, even if you were once a lawful permanent resident and had an Alien Registration Number (known as an A-Number).

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