问题补充：
The government has taken measuresair 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：考查不定式做目的状语：句意：为了改善空气质量，政府已经采取措施了。这里用不定式做目的状语，选A。
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