We can never expect____bluer sky unless we create____ less polluted world. 
A．a(chǎn); aB．a(chǎn); the
C．the; aD．the; the
A  
sky和world原本是獨(dú)一無二的,但這里前面都有了形容詞修飾,表示會出現(xiàn)一個什么樣的sky和world,這里就屬于泛反指了.  
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