父母持b1 b2 签证 入境后多久可以办绿卡 是60天 还是90天 另外给父亲单独办理 如何证明父子关系?谢谢
父母持b1 b2 签证 入境后多久可以办绿卡 是60天 还是90天 另外给父亲单独办理 如何证明父子关系?谢谢
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