我太太回国探亲，顺便做了全面体检，发现早期癌症。做了手术还需要长期化疗。可能要在国内居住超过一年以上。回美时绿卡会有问题吗？需要找移民局办什么手续保留绿卡吗？我还在美国工作。是不是这可以作为我太太还保留居住美国倾向的证据？
-If she stays in China for > one year, her green card will be void. But because her illness prevents her to come back on time, she can apply for SB-1 visa in the US Consulate in Guangzhou after her health allows her to return (provide the evidence of her illness and medical treatment). SB-1 visa allows her to reinstate her green card status.
-If she stays in China for > one year, her green card will be void. But because her illness prevents her to come back on time, she can apply for SB-1 visa in the US Consulate in Guangzhou after her health allows her to return (provide the evidence of her illness and medical treatment). SB-1 visa allows her to reinstate her green card status.
