亲爱的皮匠和863211，
一事相求。我父母在申请公民入籍。他们2004 年拿到的绿卡。在美国呆了一年多，然后申请了白皮书，2006， 2007 就回国了。2008／1－至今一直住在美国 （符合四年加一天的入籍申请）。由于拿到绿卡后，在国外呆了6个月或多于6个月，需提供5年的税表。
“If you have taken any trip outside the United States that lasted 6 months or more since becoming a Lawful Permanent Resident, send evidence that you (and your family) continued to live, work and/or keep ties to the United States, such as:
An IRS tax return “transcript” or an IRS-certified tax return listing tax information for the last 5 years (or for the last 3 years if you are applying on the basis of marriage to a U.S. citizen).
Rent or mortgage payments and pay stubs.”
可由于他们没在美国，所以没有2006 和07 的税表，更没有租房的凭证。只能提供2008，2009，2010的税表。请问如何和移民局解释，还是得再等一年多再申请。
十分感谢答复和建议。