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侄女现在在国内。看了一下给她办绿卡需要在她16岁之前和她在一起生活两年。但她以什么签证来美国呢？那种签证能两年有效吗？
-Try B2 visa and then, extend the B2 status within US if she is lucky to get the visa again and again (if she is very young). I have found some cases worked in this way.

再次感谢您的无私奉献！