The government has taken measures air quality.A. to improveB. improvedC. being improvedD.

问题补充：

The government has taken measures air quality.

A. to improve

B. improved

C. being improved

D. to be improved

答案：

(答案→)A. to improve

B. improved

C. being improved

D. to be improved

解析：考查非谓语动词。Take measures to do sth意为采取措施干某事 ，为固定结构