◎ 题干
He ____ writing the paper now. He hadn't written a single word when I left him ten minutes ago.
[     ]
A. shouldn't be
B. can't have finished
C. can't be
D. mustn't have finished
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“He ____ writing the paper now. He hadn't written a single word when I left him ten minutes ago. [ ]A. shouldn't be B. can't have finished C. can't be D.…”主要考查了你对  【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。