Recently, the serious problem of smog caused by PM2.5______greatly by the govern

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问题 Recently, the serious problem of smog caused by PM2.5______greatly by the government’s effective measures.

选项 A、improved
B、had improved
C、has been improved
D、has improved

答案 C

解析本题考查句子时态。句首的Recently一词提示，本题应使用现在完成时态；分析句子成分可知，主语是the seriousproblem，主语和谓语动词improve存在被动关系，故空格处所填动词应为第三人称单数形式，且使用被动语态。所以，C)为本题的正确答案。

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