______ on ten years of observation and study, the theory shows that every one dreams every night, whether they realized it or not.
A．BasingB．BasedC．Being basedD．Having based
B

試題分析：考查非謂語動詞作狀語。句意：基于十年的觀察和研究，這項理論表明，每個人每晚都做夢，不管他們是否意識到這一點。the theory與base之間是被動關系，故用過去分詞作狀語。選B。
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