◎ 题干
—Someone is knocking at the door. Is it Ann?
—It _____ be her. She is giving a performance at the theatre now.
A.mayB.mustC.can’tD.mustn’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“—Someone is knocking at the door. Is it Ann?—It _____ be her. She is giving a performance at the theatre now.A.mayB.mustC.can’tD.mustn’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。