【題目】I got up early this morning，but I ________ so because I was not on duty today．

A．mustn’t have done B．needn’t have done

C．didn’t need to do D．can’t have done

【答案】B

【解析】

試題分析：考查情態(tài)動(dòng)詞。句意：早晨我起得很早，但是我本沒必要這么做，因?yàn)槲医裉觳恢蛋�。needn’t have done本沒必要做某事。故選B。

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