The boy felt quite happy because he was closer now to an answer of his own.
A. have found
B. find
C. finding
D. having found
网友回答
A. have found
B. find
(答案→)C. finding
D. having found
解析：考察非谓语动词作介词宾语。be closer to 更接近于……这里to是介词，后面接名词或者动名词。动名词表示主动地伴随性的动作。完成时态的的动名词表示已经完成的动作。根据题意，这个男孩很高兴，因为他现在更接近于自己去找到自己的答案。选C。