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在留資格変更（AOS）
米国内にいながら非移民ビザから永住権に切り替える手続き。I-485申請書を提出し、面接を経て承認されます。米国外にいる場合は領事館処理（Consular Processing）を選択します。AOSの審査中は出国にAdvance Paroleが必要です。
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