签证依然有效 - 回复:请一定看看:B-2延期,若被拒或又按时回国,原签证是否有效(the old one will expir

You may write to USCIS at the address on your receipt notice to withdraw, or just leave the application alone.

http://blog.wenxuecity.com/blogview.php?date=200710&postID=39609#I539pending

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