◎ 题干
---There is somebody knocking at the door. Who________ it be?
---I’m not sure. It ________ be a postman.
A.may; mustB.will; can C.can; mayD.may; will
◎ 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“ ---There is somebody knocking at the door. Who________ it be?---I’m not sure. It ________ be a postman.A.may; mustB.will; can C.can; mayD.may; will…”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。