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We can never expect____ bluer sky unless we create_____less polluted world.

A. a; a                                   B. a; the

C. the; a                                 D. the; the

A


解析:

本題考察冠詞的用法,因為sky和world原本是獨一無二的,但這里前面都有了形容詞修飾,表示會出現一個什么樣的sky和world,這里就屬于泛反指了.

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