◎ 题干
—Who is making much noise?    
—It ____ be Timmy. He is sleeping now.  
[     ]
A. can't
B. may not
C. mustn't
D. couldn't
◎ 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“—Who is making much noise? —It ____ be Timmy. He is sleeping now.[ ]A. can't B. may notC. mustn't D. couldn'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。