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 reducedB．should have reduced
C．may have reducedD．could have reduced
B
B 考察情態(tài)動詞。句義：我們都知道本應(yīng)該減少碳，但是我懷疑很少有人能夠項Joan Pick一樣。Must have done表示對過去情況的肯定推測。過去一定…；should have done本應(yīng)該做某事，實際上卻未做。May have done或許…；表示沒有太大的把握，根據(jù)句義說明B正確。
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