◎ 题干
--Listen! Someone is knocking at the door. Who _____it be?
---It_____be Tom. He phoned to visit me this evening.
A.may;mayB.may;shouldn’tC.must;canD.must;may
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“--Listen! Someone is knocking at the door. Who _____it be?---It_____be Tom. He phoned to visit me this evening.A.may;mayB.may;shouldn’tC.must;canD.must;…”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。