The air pollution of the city ____ by 20 percent thanks to the strict measures taken by the government.
| A．has been fallen down | B．has been increased |
| C．has been reduced | D．has been risen |
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The air pollution of the city ____ by 20 percent thanks to the strict measures taken by the government.
| A．has been fallen down | B．has been increased |
| C．has been reduced | D．has been risen |
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