问题补充:
--- 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:
A. couldn’t have stayed up
B. mustn’t have stayed up
(答案→)C. shouldn’t have stayed up
D. needn’t have stayed up
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