We can never expect ____ bluer sky unless we create ____ less polluted world.A．a_刷题宝

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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

上一题下一题 0.4难度单项选择更新时间:2012-10-18 10:25:04

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