◎ 题干
The government has taken measures          air quality.
[     ]
A.to improve
B.improved
C.being improved
D.to be improved
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“The government has taken measuresair quality.[ ]A.to improveB.improvedC.being improvedD.to be improved…”主要考查了你对  【不定式】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。