分析一下句子成分 谢谢
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It 是形式主语was calculated是谓语 后面的that从句是主语从句作真主语。其中
when it population reached its highest point是从句中的状语从句 ,they were more than 3 billlion passenger pigeons是从句中的主句—a number是同位语 equal to 24 to 40 percent of the total bird population in the United States是形容词短语作后置定语, making it perhaps the most abundant bird in the world. 是现在分词短语作非限制性定语修饰前面从句中的主句。
when it population reached its highest point是从句中的状语从句 ,they were more than 3 billlion passenger pigeons是从句中的主句—a number是同位语 equal to 24 to 40 percent of the total bird population in the United States是形容词短语作后置定语, making it perhaps the most abundant bird in the world. 是现在分词短语作非限制性定语修饰前面从句中的主句。
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