No law limits how many times of application, but if you continue to apply for it from time to time, USCIS may not approved your later application. Normally, continuous renewal of one time is OK, if more, depends on your luck unless you have conviceable reasons.
回复:请教皮匠和众大侠:白皮书(白卡)最多可以申请几次?
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非常谢谢8老师的解答!
-潜心-
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03/30/2011 postreply
19:09:02