— did he play soccer?— About 15 years.A. How oftenB. How manyC. How longD. How much

问题补充：

— did he play soccer?

— About 15 years.

A. How often

B. How many

C. How long

D. How much

答案：

A. How often

B. How many

(答案→)C. How long

D. How much

解析：根据About 15 years“大约”可知，本句应该是问时间段的，故用how long。所以本题选C。