我一朋友持有綠卡，因為褪摔斷有4年沒有來美國，現在褪好了想來，不知入境會否有麻煩，他應該以何種方式才可以來美國。
-He will not be allowed to enter US using this green card. He needs to apply for the Returning Resident Visa (SB-1) visa in anyone of the US Consulates in China and then, use the SB-1 visa to enter US to activate his green card. If he can not get the SB-1 visa, his green card is void.
For SB-1 visa, see this website:
http://travel.state.gov/visa/immigrants/info/info_1333.html
.
