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我持加拿大TN簽證，在美國工作，有博士學位，怎麽申請美國綠卡？

-Two ways: 1. you sponsor yourself (i.e., self sponsored) using EB1A or NIW category;

                 2. Ask your employer to sponsor you using EB1B, EB2, or EB3 category.

需要多少時間？

-Hard to say. the time on different category is different.

請介紹有經驗的律師，謝謝！