一.由于一些原因,父母于四年前回国至今都没有来美居住,绿卡自动放弃了,现在父母想办理探亲签证来美,是否易通过? 该如何办理? - When they turn in the GC at the consulate, they're usually issued a B-2 visa with longer Visa Expiration, say maybe 10 yrs.