If an event happens "once in a blue moon," how frequently does it occur?

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A Routinely every calendar month.
B Strictly during winter seasons.
C Very rarely or almost never.
D Precisely at midnight.

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Answer: C. Very rarely or almost never.

• Answer: C
• Explanation: Once in a blue moon is an informal idiom used to describe an event that happens extremely infrequently.

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If an event happens "once in a blue moon," how frequently does it occur?

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