________ 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　[考查過去分詞形式作狀語。句意：基于10年的觀察和研究，王教授聲稱，每個人每晚都會做夢，不管他們是否意識到了。]
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