One thing is clear,that we must work together to make sure our air is fit ___ A.to be breathedB.to breatheC.breathingD.being breathing

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One thing is clear,that we must work together to make sure our air is fit ___ A.to be breathedB.to breatheC.breathingD.being breathing
One thing is clear,that we must work together to make sure our air is fit ___ A.to be breathed
B.to breathe
C.breathing
D.being breathing

One thing is clear,that we must work together to make sure our air is fit ___ A.to be breathedB.to breatheC.breathingD.being breathing
选B.be fit to do sth 适合做某事.不能用被动.我是英语专业的,