题目内容
I got up early that morning, but I _____ so because I had no work to do.
| A．mustn’t have done | B．didn’t need to do | C．needn’t have done | D．can’t have done |
C
needn’t have done表示“过去不必做而做了某事”，若表示“不必做某事（且实际上未做）”则用“didn’t / don’t / doesn’t need to.”
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