As you worked late yesterday, you _______ have e this morning.A.mayn'tB.can'tC.mustn'tD.needn't
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D解析句意：由于你昨天工作得很晚，今天早晨你本不需要来的。此题考查了“情态动词+完成式”的形式。mustn't have done是一种错误的形式，可以排除C；其次can't have done表示对过去否定的推测；mayn't have done表示过去可能没做某事；只有needn't have done表示“过去不必做某事但做了某事”。