◎ 题干
—Can you answer the last question?
—No, I _______. It's too difficult.

[     ]

A. mustn't
B. can't
C. needn't
D. shouldn't
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“—Can you answer the last question?—No, I _______. It's too difficult.[ ]A. mustn'tB. can't C. needn't D. shouldn't …”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。