◎ 题干
--- Mum, I am feeling tired and sleepy now.
--- You         so late last night.
A.couldn’t have stayed upB.mustn’t have stayed up
C.shouldn’t have stayed upD.needn’t have stayed up
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“--- Mum, I am feeling tired and sleepy now. --- You so late last night.A.couldn’t have stayed upB.mustn’t have stayed upC.shouldn’t have stayed upD.needn’t…”主要考查了你对  【虚拟语气】【情态动词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。