剛和過去的一位朋友聯係過，他的情況和我的一樣。然而，在他當初遞交I-485時，他的律師堅持：“Date of Last Arrival“ 應該是從加拿大回美國的時間。結果悲劇了！ 然後另請律師，又花了近 $8000 和三年多的時間才拿到綠卡。不過，他自己和他的律師 並不十分確定，“Date of Last Arrival“ 應該是哪個時間，因為後來他有提交了整整2個箱子的材料（寄到移民局），證明自己是合法入境，不知道究竟是哪個材料其了作用。
-Just do what I suggested above. If USCIS send you RFE about your travel to Canada, then you can explian it later. Now you do not need to mean it in your I-485 filing. Technically, only if you surrender your I-94 when you leave US and then, get a new I-94 when you reenter US, then can you be considered that you have been out of US and returned.
The definition of an I-94:
The form I-94 is the Arrival / Departure Record, issued by a CBP Officer to foreign visitors entering the United States.
The I-94 must be turned in to a CBP Officer at a land border or airline representative when the visitor exits the U.S.
