单选题：听音频，回答以下问题。When did Miss Green become a swimming star?

题目内容：

听音频，回答以下问题。
When did Miss Green become a swimming star? A．At the age of 15．
B．At the age of 20．
C．At the age of 18．
D．At the age of 16．

参考答案：

答案解析：

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