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，通常居住在中国，每5、6个月来美国一趟，保持着绿卡。

2020年元旦来过之后，就因为疫情不怎么出门了，这么久没来，现在还能来吗？会不会在入关时被遣返，还是会没收绿卡，以其他身份让他进来？

-Techincally, the green card is void, so he cannot use it to enter US. But if he is lucky at the port of entry, the IO may allow him to enter US if the IO is not very strick, but it is very risky.

正确的解决方法是什么，去美国驻华领事馆办理什么文件吗？

-He may try to apply for SB-1 visa to enter US to reinstall his green card if he  has absolute reasons to convince the VO at the US Consulate, but it is extemely difficult to get teh SB-1 visa. Covid 19 alone is not a enough reason to get the SB-1 visa.

如果被取消绿卡，影响以后办B1/B2签证吗？

-He may abandon the green card volunteerly, then apply for the B2 visa to visit US later.