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 |
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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 |
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