on hearing this jane looked up,on hearing this 在句中做什么成分,hearing是不是现在分词作主语

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on hearing this jane looked up,on hearing this 在句中做什么成分,hearing是不是现在分词作主语
on hearing this jane looked up,
on hearing this 在句中做什么成分,hearing是不是现在分词作主语

on hearing this jane looked up,on hearing this 在句中做什么成分,hearing是不是现在分词作主语
On hearing this,是介词短语在句子中作时间状语,在意思上与As soon as she heard this 同义,又如:
On seeing her mother,Jane ran to her.=As soon as she saw her mother,Jane ran to her.
欢迎提问,

作状语,可看做修饰后句:一听到这,简抬起头来。hearing是动名词,因为用在介词on后面,不是主语。这句可改为;When Jane heard this, she looked up.