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父母拿移民签证入境已2月有余。正式绿卡尚未收到。现在可否申请回美证？谢谢！

-Yes. They can use the copy of the immigant visa page which was stamped/endorsed for the reentry permit application. But why do they apply for reentry permit so early? They can travel to China and come back within 6 months using the green card or the endorsed immigrant visa stamp.