The air pollution of the city ____ by 20 percent thanks to the strict measures taken by the governme

题目简介

The air pollution of the city ____ by 20 percent thanks to the strict measures taken by the governme

题目详情


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 increased
C.has been reducedD.has been risen
题型:单选题难度:偏易来源:不详

答案

C

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