What does "once in a blue moon" mean in this sentence: "I rarely go to the cinema, only once in a blue moon."?

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A Frequently
B At night
C Very rarely
D Once a month

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Answer: C. Very rarely

Answer: C. Very rarely
Explanation: "Once in a blue moon" means something happens very infrequently

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What does "once in a blue moon" mean in this sentence: "I rarely go to the cinema, only once in a blue moon."?

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