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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.
    A．is not polluted
    B．would not be polluted
    C．had not been polluted
    D．would not have been polluted
    B
    选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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