_____many times, they succeeded _________ the experiment.
A．Having tried; in doingB．Tried; in being done
C．Having tried; to doD．Tried; doing
A
考查非謂語(yǔ)動(dòng)詞。主語(yǔ)they與try之間是主動(dòng)關(guān)系，故用現(xiàn)在分詞。分詞的動(dòng)作發(fā)生在謂語(yǔ)動(dòng)詞之前，所以用現(xiàn)在分詞的完成式，短語(yǔ)：succeed in doing sth 成功做成某事，句意：嘗試了許多次之后，他們成功的做成了實(shí)驗(yàn)。所以選A。
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