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英语代词专练At first,they talked happily.Then they turned into com

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英语代词专练At first,they talked happily.Then they turned into complains about stress in work
and life.After hearing( this ),the professor went to the kitchen and brought a large pot of office and differen-t kinds of cup.
为什么要用this?this指什么
this 代词 代 之前的谈话.