◎ 题干
____ of their bad habits, the boys switched from being dependent on their parents to ____ for others.
A.Having rid; sacrificingB.Rid; sacrificing
C.Having been rid; sacrificeD.To rid; sacrifice
◎ 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“____ of their bad habits, the boys switched from being dependent on their parents to ____ for others.A.Having rid; sacrificingB.Rid; sacrificingC.Having been …”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。