◎ 题干
—Listen! Helen is singing in the next room.
—It _______ be Helen. She has gone to Beijing.

[     ]

A. can't
B. mustn't
C. may
D. should
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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! Helen is singing in the next room.—It _______ be Helen. She has gone to Beijing.[ ]A. can't B. mustn't C. may D. should …”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。