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如果可以按公民結婚三年後申請綠卡，有沒有3年內必須再美國居住多久的限製？

-You can apply for the US citizen after 3 years from the date you married the US citizen or 5 years from the  date you got the green card. See this website for the physical presence and residence continuity requirements:

https://www.uscis.gov/us-citizenship/citizenship-through-naturalization/continuous-residence-and-physical-presence-requirements-naturalization