◎ 题干
--- Look! It ____ be Jack on the playground.
---It ____ be him. Because I saw him enter the school library just now.
A. may; mustn’t           B. must; can’t        C. can; can’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“--- Look! It ____ be Jack on the playground.---It ____ be him. Because I saw him enter the school library just now.A. may; mustn’t B. must; can’tC. can…”主要考查了你对  【助动词】【介词短语】【固定搭配】【疑问词组】  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。