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Recently, the serious problem of smog caused by PM2.5______greatly by the govern
Recently, the serious problem of smog caused by PM2.5______greatly by the govern
游客
2024-06-24
11
管理
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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