what visa will I need to come to US for conference?

来源: 于 2009-10-04 09:43:15 [旧帖] [给我悄悄话] 本文已被阅读：次

What kind of visa can I get to come to US for conference or visiting from Canada, once I transfter green card application to CP? I have a new AP, can I still use that?
Thank you very much!