The air pollution of the city ____ by 20 percent thanks to the strict measures taken by the government.A．has been fallen downB．has been increasedC．has been redu-高中英语-n多题

◎ 题干

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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