Juat a guess, you must have indicated that in your current or previous application that your mum will/would visit ... and USCIS wanted to prove so. Otherwise I-94 would be good enough.
Good luck!
回複:b2延期需補材料--求助
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回複:回複:b2延期需補材料--求助
-Nyjing-
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11/11/2009 postreply
13:45:57