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【题目】We can never expect ____ bluer sky unless we create ____ less polluted world.

A. a; a B. a; the

C. the; a D. the; the

【答案】A

【解析】两个空都是不可数名词表示泛指,所以都用不定冠词。句意:如果我们不创造一个环境污染更少的世界,我们就永远不能期望拥有一片更蓝的天空。

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