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1，几种方式？有K3签证（来美国再申请临时绿卡）？，直接在美驻中使馆申请移民签证？

2，各种方式大致时间表？

-Normally, K3 is faster than immigrant visa. It is hard to predict how long, case by case.

各利弊以及注意事项？

-Provide strong evidences of your bona fide marriage.