◎ 题干
    by the loss of such a valuable jewel,Rachel’s mother hires the famous detective Sergeant Cuff to investigate the theft.
A.TroublingB.To trouble
C.To troubledD.Troubled
◎ 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“ by the loss of such a valuable jewel,Rachel’s mother hires the famous detective Sergeant Cuff to investigate the theft.A.TroublingB.To troubleC.To troubledD.T…”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。