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_____many times, they succeeded _________ the experiment.
A.Having tried; in doingB.Tried; in being done
C.Having tried; to doD.Tried; doing
A
考查非谓语动词。主语they与try之间是主动关系,故用现在分词。分词的动作发生在谓语动词之前,所以用现在分词的完成式,短语:succeed in doing sth 成功做成某事,句意:尝试了许多次之后,他们成功的做成了实验。所以选A。
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