Some environmentalists are dubious of the statement that the air quality in this

游客2023-10-27 31

问题 Some environmentalists are dubious of the statement that the air quality in this city has ______ since 2000.

选项 A、decreed
B、defaulted
C、deteriorated
D、degraded

答案 C

解析

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A.completeB.useC.requiredD.proceduresE.permittedF.qualityG.