Is there an adapter or what do I do for a 3 wire dryer plug to go into a 4 wire receptacle?

I purchased a dryer that has a 3 wire, 220 volt plug. I did not realize that 220 had a 3 and a 4 wire plug. The electrician installed a 4 wire recepticle, so now I cannot use the dryer. Is there an adapter I can purchase to convert the 3 wire plug to fit the four wire. What are my options?