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If you export the file from excel into a Tab Delimited File with a ".txt" extension. You can then import this file into Acrobat from the "Prepare Form" tools. This will give you a popup dialog listing all the entries in the ".txt" file. It is extremely important that the column headers in Excel exactly match the field names in the PDF file
Alternatively I have tools and tutorials on this topic here:
That allows you to import data, but not the options of a drop-down field...