【題目】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．運動。Over the past+時間，在過去的…… 該時間狀語表示現(xiàn)在完成時，即已經(jīng)減少（“has reduced”）

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