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We can never expect ________ bluer sky unless we create ________ less polluted world.(2009·安徽)
A.a;aB.a;theC.the;aD.the;the
A
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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