◎ 题干
— Hi, Mary. Any idea where Bill is?
— He ______ in the library. I saw him reading books there just now.
A.shall be B.should have been C.must be D.might have been
◎ 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“— Hi, Mary. Any idea where Bill is?— He ______ in the library. I saw him reading books there just now.A.shall be B.should have been C.must be D.might have be…”主要考查了你对  【虚拟语气】【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。