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《新概念英语》(第三册)第一课《A Puma at Large》

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《新概念英语》(第三册)第一课《A Puma at Large》
Pumas are large,cat-like animals which are found in America.When reports came into London Zoo that a wild puma had been spotted forty-five miles south of London,they were not taken seriously.However,as the evidence began to accumulate,experts from the Zoo felt obliged to investigate,for the descriptions given by people who claimed to have seen the puma were extraordinarily similar.
其中,这下面这句话的句型改如何解释的?
However,as the evidence began to accumulate,experts from the Zoo felt obliged to investigate,for the descriptions given by people who claimed to have seen the puma were extraordinarily similar.
首先,for是连词,将这句话分为前后两句并列分句.
对于前一分句,as引导时间状语从句,主句是experts...investigate
对于后一分句,descriptions是主语,谓语是were,表语是extraordinarily similar 其中,given...puma是过去分词后置做为descriptions的定语,而who...puma又是一句定语从句修饰people
整个结构就是这样~~