The version to be closest to the author’s original now belongs to a national museum in Pa

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A. was thought
(答案→)B. thought
C. is thought
D. thinking
解析：考查非谓语动词作后置定语。句子主语是The version，谓语动词是belongs to，所以version后面是非谓语动词作后置定语，且version和think之间是动宾关系，所以用过去分词thought表被动。选B。