is becoming ,became,has become,aged,ages,age Over the last fifteen years, running_______ a popular pastime for 30 million partic

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问题 is becoming ,became,has become,aged,ages,age
Over the last fifteen years, running_______ a popular pastime for 30 million participants of all ______.

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答案has become,ages

解析 第一空由标志词over the last fifteen years可知应用现在完成体;第二空表示“在所有的年龄段”用固定搭配of all ages。答案为has become,ages。
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