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Having been knocked down by a car,he spent a week in the hos

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Having been knocked down by a car,he spent a week in the hospital.
为什么句子的开头会用having
Having been knocked down by a car,he spent a week in the hos
这是一个分词表示原因的一个语法结构.
还原成原因状语从句就是 Because he have been knocked down by a car,he spent a week in the hospital.
由于两个句子的主语都是一样的he ,所以可以把从句中的because he 去掉,留下其过去分词做一个表示原因的成分.