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.We can never expect _________ bluer sky unless we create _________ less polluted world.
A.a;aB.a;the
C.the;aD.the;the
A

句意为:如果我们不创造一个环境污染减少的世界,我们永远不会期望拥有一个更蓝的天空。根据句意,a bluer sky和a less polluted world为可数名词表示泛指,所以用不定冠词。
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