(2013·河南省普通高中适应性检测卷一)People spend many years learning about favorite sports and how to do them well.
A. practice
B. practiced
C. practicing
D. to practice
网友回答
A. practice
B. practiced
(答案→)C. practicing
D. to practice
解析：选C 考查非谓语动词。spend ... (in) doing sth.表示“花费……做某事”，根据and可知，空处应与learning并列，作省略了的介词in的宾语，故选C。