◎ 题干
But for their common interests, they_____ cooperated so smoothly in the investigation of the case.
A.could haveB.will not haveC.could not haveD.have not
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“ But for their common interests, they_____ cooperated so smoothly in the investigation of the case.A.could haveB.will not haveC.could not haveD.have not…”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。