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

 

B

【解析】B 考察情態(tài)動詞。句義：我們都知道本應該減少碳，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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