◎ 题干
When he saw all his books _____ here and there on the floor, he knew that something terrible _____.
A.lying; must have happenedB.lie; must happen
C.lay; might have happenedD.had lain; could have happen
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“ When he saw all his books _____ here and there on the floor, he knew that something terrible _____. A.lying; must have happenedB.lie; must happen C.lay; mig…”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。