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表示類別，是指blue whale 這一類動(dòng)物；第二空用a表示泛指。

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