题目内容

________ on ten years of observation and study, Professor Wang announced that everyone dreams every night,whether they realize it or not.
A.BasingB.Based
C.Been basedD.Having based
B
B [考查过去分词形式作状语。句意:基于10年的观察和研究,王教授声称,每个人每晚都会做梦,不管他们是否意识到了。]
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