Question on AC21 for Interfiled I-485

shokaido

Registered Users (C)
I have an I-485 pending originally filed for an approved EB2-NIW I-140. Also I have an approved EB1-OR I-140. Several months ago I mailed to ask NSC interfile my I-485 to follow EB1 I-140, but, as usual, no written confirmation to my request.

Since my I-485 has been pending for more than 6 months, could I use AC21 while still keeps the I-485 with the EB1 I-140? EB1 is preferred for me because of the retrogression.
 
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