Which one of the following means 'Something that occurs very rarely' ?
AOnce in a blue moon
BOnce upon a time
Conce bitten, twice shy
DNone of these
AOnce in a blue moon
BOnce upon a time
Conce bitten, twice shy
DNone of these
Related Questions:
What is the meaning of the idiomatic expression in the following sentence ?
Our entire class is quaking in its boots.