We can never expect bluer sky unless we create less polluted world.学科网学科网 A. a; a ——青夏教育精英家教网—

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2、We can never expect bluer sky unless we create less polluted world.学科网学科网

A. a; a B. a; the学科网学科网

C. the; a D. the; the学科网学科网

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2、

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We can never expect bluer sky unless we create less polluted world.学科网学科网

A. a; a B. a; the学科网学科网

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We can never expect bluer sky unless we create less polluted world.学科网学科网

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