With green card, of course you can leave US but may not be able to enter Canada without a Canadian Visa. It is clear on CIC web site, "anyone who does not have citizenship in a country that is on the Canadian VISA-waiver list needs a VISA to enter Canada."最初由 azneye 发布
我老爸看过了,他说只要带着绿卡买好机票就可以过来了,不用签证的,从美国去加拿大的游客还可以自己开车过去