The answer is 3. It is possible that I met him some time ago.
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EnglishmavenThe answer is 3. It is possible that I met him some time ago.Doesn't "should have met" express the action that might have happened in the past but, in fact, didn't happen?
sunny123I think 3 is correct but I'm not sure again.4 is correct but, you have the choice of replacing "may" with the word might.