three times in a row, the boxer decided to make a fourth attempt, though．
A. Having defeated
B. To have defeated
C. Having been defeated
D. To defeat
网友回答
A. Having defeated
B. To have defeated
(答案→)C. Having been defeated
D. To defeat
解析：考查非谓语动词做状语。主语the boxer与defeat之间是被动关系，且分词的动作发生在谓语动词之前，所以用现在分词的完成被动式。所以选C。