(1)
(2)must 情态动词，have come from ---- 完成时态
(3)主谓表结构,cat-like -- 复合形容词
(4)which--关系代词，在定语从句中作主语，先行词是animals，are found -- 被动语态。
(5)into London Zoo -- 介词短语，作came的方位状语
(6)that -- 引导同位语从句，reports的同位语，had been spotted -- 过去完成被动语态
(7)数词作状语
(8)were not taken -- 被动语态，seriously -- 副词，serious -- 形容词
(9)as -- 连词，引导原因状语从句，to accumulate -- 不定式作宾语
(10)from the zoo -- 介词短语作定语，felt obliged to -- 后接动词原形
(11)for -- 连词引导原因状语从句，given by people -- 过去分词短语作定语，可改为定语从句which are given by people
(12)to have seen不定式作宾语
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