题目内容

______ on ten years of observation and study, the theory shows that every one dreams every night, whether they realized it or not.

A.Basing B.Based C.Being based D.Having based

B

解析试题分析:考查非谓语动词作状语。句意:基于十年的观察和研究,这项理论表明,每个人每晚都做梦,不管他们是否意识到这一点。the theory与base之间是被动关系,故用过去分词作状语。选B。
考点:考查非谓语动词作状语

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