所謂十年綠卡，就是解除婚姻綠卡上的兩年條件。現在解除條件（I-751）大約要一年半到兩年時間。
如果一個移民在等待I-751期間到達符合申請公民的條件（距離最初兩年綠卡拿到時間是兩年九個月，因為可以提前90天申請公民），這個移民可以申請公民。
兩個申請將同時在USCIS等待批準，USCIS的政策是綠卡必須先於或者同時與公民申請批準。
https://www.uscis.gov/policymanual/HTML/PolicyManual-Volume12-PartG-Chapter5.html
2. Spouses with Pending Petitions and Naturalization Applications
An application for naturalization may not be approved if there is a pending petition for removal of conditions. If an applicant’s petition to remove conditions is pending at the time of filing or is filed prior to the interview, USCIS will adjudicate the petition to remove conditions prior to or concurrently with the adjudication of the naturalization application.
