Complete the summary by choosing one sentence (A, B, C, or D) that is among the most important ideas in the passage in the blank.
A.Because a blue moon is uncommon, “once in a blue moon” means “rarely” or “never”.
B.The calendar devised by the Romans works well .
C.The lunar calendar was invested by Julius Caesar and Augustus Caesar.
D.The Roman calendar is still in use today.
A.Because a blue moon is uncommon, “once in a blue moon” means “rarely” or “never”.
B.The calendar devised by the Romans works well .
C.The lunar calendar was invested by Julius Caesar and Augustus Caesar.
D.The Roman calendar is still in use today.
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