to be a football player of the school team, the boy made up his mind to train even harder

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A. Having not chosen
B. Being not chosen
(答案→)C. Not having been chosen
D. Having not been chosen
解析：句意：没有被选中做校队的足球运动员，这个男孩决定更加努力的训练。这里需要非谓语动词做状语，因为是先没有被选中，然后才下决心，所以用现在分词的完成式，而且否定词not放在非谓语动词前面，所以选C。