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  1. Once in a blue moon
    1. An sacrificial event carried out in night
    2. An event that happens only in moonlight
    3. An event which happens very rarely
    4. An auspicious event
Correct Option: C

When we say that something happens once in a blue moon, what we mean is that it happens very rarely

Once in a blue moon I go to the cinema as the movie tickets these days are very very expensive

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