When I was only ten years old,Icould run 50 meters in 40 s____填一个单词撒!构成句子嘛!

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When I was only ten years old,Icould run 50 meters in 40 s____填一个单词撒!构成句子嘛!
When I was only ten years old,Icould run 50 meters in 40 s____
填一个单词撒!构成句子嘛!

When I was only ten years old,Icould run 50 meters in 40 s____填一个单词撒!构成句子嘛!
填second,秒
整句意思是,10岁时,50米跑我能用40秒.(好像有点慢撒……)