Over the last fifteen years，running has become a popular（）for 30 million participants of allages.
考试：
科目：（在线考试）
问题：
A：fantasy
B：pastime
C：symposium
D：penalty
答案：
解析：
相关标签：
Over the last fifteen years，running has become a popular（）for 30 million participants of allages.
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