问题补充：
many times, they succeeded the experiment.
A. Having tried; in doing
B. Tried; in being done
C. Having tried; to do
D. Tried; doing
答案：
(答案→)A. Having tried; in doing
B. Tried; in being done
C. Having tried; to do
D. Tried; doing
解析：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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