many failures, I have the courage to meet all challenges.
A. Having experienced
B. To experience
C. Experienced
D. Experience
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(答案→)A. Having experienced
B. To experience
C. Experienced
D. Experience
解析：考查非谓语动词。句意：我在经历了许多次失败之后，我有勇气来迎接所有的挑战。经历失败的动作发生在谓语动词之前，故用现在分词的完成式Having experienced做状语。在这里做时间状语，相当于after I have experienced many failures.所以选A。