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The biggest whale is ___ blue whale, which grows to be about 29 meters long—the height of ___ 9-story building.  

A. the; the      B. a; a      C. a; the     D. the; a  

D  


解析:

第一空用the+n表示类别,是指blue whale 这一类动物;第二空用a表示泛指。  

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