I got up early that morning, but I _____ so because I had no work to do.
A．mustn’t have doneB．didn’t need to do C．needn’t have doneD．can’t have done
C
needn’t have done表示“過(guò)去不必做而做了某事”，若表示“不必做某事（且實(shí)際上未做）”則用“didn’t / don’t / doesn’t need to.”
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