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求英语高手分析句子结构Thesnakeisonthelist,andisextinctintwoeasternstatesinwhichitonceflourished.其中and后面那句是主系表结构吗?intwoeasternstates是什么成分?

题目详情
求英语高手分析句子结构
The snake is on the list,and is extinct in two eastern states in which it once flourished.其中and后面那句是主系表结构吗?in two eastern states是什么成分?
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答案和解析
The snake 主语
is on the list,系表结构,做复合谓语
and is extinct 与is on the list并列,系表结构,做复合谓语
in two eastern states 介词短语,做地点状语
in which it once flourished.定语从句