◎ 题干
—Someone is knocking at the door. Who ______ it be?
—It ______ be Tom. He is still in the school.
A.may; can’tB.can; mustn’t
C.might; couldn’tD.could; may not
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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. Who ______ it be? —It ______ be Tom. He is still in the school.A.may; can’tB.can; mustn’tC.might; couldn’tD.could; m…”主要考查了你对  【实义动词的单数第三人称形式】【实义动词】【动词短语】  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。