◎ 题干
-Mum, I am feeling tired and sleepy now.  
-You          so late last night.  
[     ]
A. couldn’t have stayed up            
B. mustn’t have stayed up  
C. shouldn’t have stayed up          
D. 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. -Youso late last night. [ ]A. couldn’t have stayed upB. mustn’t have stayed up C. shouldn’t have stayed up D. n…”主要考查了你对  【虚拟语气】  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。