问题描述：
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
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
问题解答：
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