◎ 题干
He promised to do what he ______ sure of _______.
A.could make; my happyB.could to make; me happy
C.could make; my happinessD.could to make; my happiness
◎ 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“ He promised to do what he ______ sure of _______.A.could make; my happyB.could to make; me happyC.could make; my happinessD.could to make; my happiness…”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。