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(2013·陕西师大附中模拟)If we had taken such effective measures much earlier, the river ________ so seriously now.

Ais not polluted

Bwould not be polluted

Chad not been polluted

Dwould not have been polluted

 

B

【解析】B 句意:如果我们早采取有力措施,现在河水就不会污染这么严重。主句表示与现在事实相反的虚拟语气,用would加动词原形。

 

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