◎ 题干
— Who’s singing in the next room?
— It ______ be Mary. She ______ New York.
A.mustn’t, is in B.must, has gone to C.could, has been in D.can’t, has gone to
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“— Who’s singing in the next room? — It ______ be Mary. She ______ New York. A.mustn’t, is inB.must, has gone toC.could, has been inD.can’t, has gone to…”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。