◎ 题干
_____many times, they succeeded _________ the experiment.
A.Having tried; in doingB.Tried; in being done
C.Having tried; to doD.Tried; doing
◎ 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“ _____many times, they succeeded _________ the experiment.A.Having tried; in doingB.Tried; in being doneC.Having tried; to doD.Tried; doing…”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。