"Once in a blue moon" means
A
very often
B
full moon night
C
on a moon-lit night
D
very rarely
Correct Answer: very rarely
Once in a blue moon অর্থ - কদাচিৎ ; কখনও না অর্থাৎ very rarely or never. তাই (ঘ) ই সঠিক উত্তর।