◎ 题干
________on ten years of observation and study,   Professor Wang announced that everyone dreams
every night,   whether they realize it or not.
[     ]
A. Basing  
B. Based
C. Been based  
D. Having based
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“________on ten years of observation and study, Professor Wang announced that everyone dreamsevery night, whether they realize it or not.[ ]A. BasingB. Based C…”主要考查了你对  【过去分词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。