◎ 题干
He worked hard and achieved what he set out to do, but ________ what he had owned, including his health and his marriage.
A.at the mercy ofB.at the risk of
C.at the cost ofD.at the service of
◎ 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 worked hard and achieved what he set out to do, but ________ what he had owned, including his health and his marriage.A.at the mercy ofB.at the risk ofC.at t…”主要考查了你对  【介词和介词短语】  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。