◎ 题干
---Someone’s been here. Who ___ it be? It looks like Helen.
---It ___ be Helen.She is ill in hospital.
A.must; mustB.might; couldC.can; mustn’tD.can; can’t
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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’s been here. Who ___ it be? It looks like Helen.---It ___ be Helen.She is ill in hospital.A.must; mustB.might; couldC.can; mustn’tD.can; ca…”主要考查了你对  【虚拟语气】【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。