新概念三第一课课文第二句为什么是同位语从句?从那看出来的?when reports came into london zoo that a wild puma had been spotted forty-five miles south of london,they were not taken seriously.为什么是同位语从句而不是

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新概念三第一课课文第二句为什么是同位语从句?从那看出来的?when reports came into london zoo that a wild puma had been spotted forty-five miles south of london,they were not taken seriously.为什么是同位语从句而不是
新概念三第一课课文第二句为什么是同位语从句?从那看出来的?
when reports came into london zoo that a wild puma had been spotted forty-five miles south of london,they were not taken seriously.为什么是同位语从句而不是定语从句?不懂啊
还有,怎么能看出that是否充当了成分呢?是不是看that去掉了整句话的句子就读不通了呢?

新概念三第一课课文第二句为什么是同位语从句?从那看出来的?when reports came into london zoo that a wild puma had been spotted forty-five miles south of london,they were not taken seriously.为什么是同位语从句而不是
同位语从句是一个补充先行词的从句.也就是先行词=同位语从句.
这里 that a wild puma had been spotted forty-five miles south of london就是news.不是去修饰news,所以不是定语从句