With his attention___(concentrate) other things ,he knocked an old man down while riding to school.为什么用“-ed”形式而不用“-ing”形式?

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With his attention___(concentrate) other things ,he knocked an old man down while riding to school.为什么用“-ed”形式而不用“-ing”形式?
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With his attention___(concentrate) other things ,he knocked an old man down while riding to school.为什么用“-ed”形式而不用“-ing”形式?
With his attention___(concentrate) other things ,he knocked an old man down while riding to school.
为什么用“-ed”形式而不用“-ing”形式?

With his attention___(concentrate) other things ,he knocked an old man down while riding to school.为什么用“-ed”形式而不用“-ing”形式?
___(concentrate) 的主语是 other things ,由于他把注意力集中在了其他事情上.所以才撞倒了老人.其他事情与he是被动关系.其他事情是被他注意的.所以应该选-ED形式