◎ 题干
— Sorry, Professor Smith. I didn't finish the assignment yesterday.
— Oh, you _____ have done it as yesterday was the deadline.
[     ]
A. must
B. mustn't
C. should
D. shouldn't
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“—Sorry, Professor Smith. I didn't finish the assignment yesterday.—Oh, you _____have done it as yesterday was the deadline. [ ]A. mustB. mustn't C. shoul…”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。