You filed incorrectly.
You needed to file as a dual-status alien UNLESS you spent time in the U.S. in 2007 on either a H-1, H-1B or L-1 visa.
You will need to amend your 2008 return and attach the properly-prepared dual-status return to the Form 1040X.
BTW,
a dual-status return is NOT a return for amateurs. Get professional help from someone who has experience filing such returns.
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