要说下为什么,()the book,he found out some answers to this question

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要说下为什么,()the book,he found out some answers to this question .A.as he reading B.at his reading C.as reading D.on reading

选D,此处意为“一~就”,on/upon为介词,后接名词或动词的ing形式.
On/upon reading reading the book,he found out some answers to this question.
若用as,as用作连词,连接一个时间状语从句,意为“当~时候”.应该为 As he was reading the book,he found out some answers to this question.故C不对.
at没有这样的用法.

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