最权威的AILA的指导文件: http://www.mitbbs.com/article_t/EB23/31966117.html 12-05-2013 Multiple I-140s, Priority Date Retention, and the 2013 China EB-2 /EB-3 Anomaly (.pdf 504 KB) AILA Practice Pointer providing guidance and tips for filing multiple I-140 petitions for qualified employment-based beneficiaries, particularly in light of the recent advancement of the EB-3 China priority date cut-off past the EB-2 priority date cut-off. AILA Doc. No. 13120548. http://www.aila.org/recentposting/recentpostinglist.aspx