As you worked late yesterday, you have come this morning.A.mayn'tB.can't
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As you worked late yesterday, you _______ have come this morning.
A.mayn't
B.can't
C.mustn't
D.needn't
试题答案
D
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”。