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We can never expect____bluer sky unless we create____ less polluted world. 
A.a; aB.a; the
C.the; aD.the; the
A  
sky和world原本是独一无二的,但这里前面都有了形容词修饰,表示会出现一个什么样的sky和world,这里就属于泛反指了.  
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