◎ 题干
Among the 15-year-old children, some        studying in university while others are still learning to read and write.
A.should have beenB.would have beenC.can beD.must be
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Among the 15-year-old children, some studying in university while others are still learning to read and write.A.should have beenB.would have beenC.can beD.must …”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。