题目内容
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
C
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题目内容
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
C