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onhearingthisjanelookedup,onhearingthis在句中做什么成分,hearing是不是现在分词作主语

题目详情
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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答案和解析
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.
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