Q&A Human Verification works pretty well, or at least it has for my site. Go to Settings > Options > Human Verification Options and make sure "Register" is checked. (If it isn't, check it and hit Save). Then go to Settings > Human Verification Manager and click the "Question & Answer Verification" radio button and hit Save. Then on the bottom part, add some questions. In my experience they don't have to be hard at all, but some people say if they're too easy spambots will get past by guessing common answers (like numbers, colors, etc).
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