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    【题目】A public health campaign _____ the number of heart disease deaths by 80 percent over the past three decades．

    A．had reduced B．had been reduced

    C．has reduced D．has been reduced

    【答案】C

    【解析】Campaign,n．运动。Over the past+时间，在过去的…… 该时间状语表示现在完成时，即已经减少（“has reduced”）

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