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Administrative Processing实在是太久了，我有可能在等待期内入籍加拿大。
 能不能让使馆把面试时收走的材料（主要是I-797表）先退回来？是不是要先取消签证申请？
-You can withdraw the visa application if you want to, then you ask the US Consulate to return the application materials to you.

 如果I-797表原件拿不回来，能不能用Offer Letter + I-797表复印件 + 加拿大护照过境？还需要别的材料吗？
-You must use the original I-797 approval notice if you don't have an H-1 visa after you become a Canadian citizen.

 如果这样走，需要先取消签证申请吗？

烦请8老师和皮老师指点迷津！谢谢！