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

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

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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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