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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】

试题分析:考查冠词用法。句意:除非我们创造一个很少被污染的世界,否则我们决不要期望一个更蓝的天空了。此句中sky与world前都有形容词bluer,polluted修饰,由此可知,属于泛指表示一个……,且unless 前后的句子,表达意思属一致,故选A。

考点:考查冠词用法。

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