Multiple choice softskills communication

Once in a ______ I go to the theater.

  1. blue sun

  2. blue day

  3. blue moon

  4. red moon
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

'Once in a blue moon' is an idiom that means very rarely or infrequently. There is no idiomatic expression 'blue sun' or 'red moon'. 'Blue day' is not part of any common idiom about rarity.

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