◎ 题干
Among the 15-year-old children, some ____ studying in university while others are still learning to read and
write.
[     ]
A. should have been
B. would have been
C. can be
D. 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 been B. would have beenC…”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。