◎ 题干
—Who's that boy reading in the garden? Is it David?  
—It ____be David. I saw him in the classroom just now.  
[     ]

A. must    
B. can't      
C. may      
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“—Who's that boy reading in the garden? Is it David? —It ____be David. I saw him in the classroom just now. [ ]A. must B. can'tC. mayD. 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。