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The description on the page you see listed in google could be the same as the page you are delivered. The page that you are delivered, however, has no <keyword> tag. No need!
It's all possible. I have seen a lot of sites at the number 1 position that are seriously cloaked.
Forget the ranking ability of the meta description. Think about what information you want to convey to the person looking at your entry in the SERPs.