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  • 科目:英语
  • 题型:单选题
  • 难度:中等
  • 人气:317

A huge balloon is telling people in Paris how good or bad the air quality is. When it’s good, the balloon shines green.       ,it’s red.

A.When worse
B.If bad
C.Though terrible
D.Whenever good
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AhugeballoonistellingpeopleinP