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  • 科目:英语
  • 题型:单选题
  • 难度:中等
  • 人气:1073

We all know that we ________ our carbon footprint, but I suspect that many people wouldn't be prepared to go as far as Joan Pick, a retired scientist living in south London.

A.must have reduced B.should have reduced
C.may have reduced D.could have reduced
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Weallknowthatweourcarbonfootpr