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Land animals are believed ______ from se...

Land animals are believed ______ from sea animals.

A. to developB. developing

C. developed D. to have developed

 

D 【解析】 试题分析:考查固定句型;句意:陆栖动物被认为是从海洋生物发展而来。Be believed to have done 被 认为已经做了某事,故选D项。 考点 : 考查固定句型  
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