◎ 题干
They love their daughter so much that they are always ready to do everything they can ________ her happiness.
A.to make sure of B.make sure of
C.be sure of D.to be sure of
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“They love their daughter so much that they are always ready to do everything they can ________ her happiness.A.to make sure ofB.make sure ofC.be sure ofD.to be …”主要考查了你对  【现在分词的被动式】【现在分词】【不定式的被动式】【过去分词】  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。