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提交485并录指纹后还有可能绿卡申请被拒吗？

-It is possible.

同时还没拿到回美证前，家人可以用有效的H4的签证回国吗？

-Yes. But if your PD is earlier than the Final Action Date (PD is current), your spouse and child had better use AP to travel in case your I-485 is approved during their travel, thus their H-4 visa will be void.

已递交485，本周也已录指纹，但材料里提过夫妻都曾经是共产党员，但最迟2012年初已退党，这种情况会被拒吗？

-should be fine.

按实写但现在还是有点担心。