One thing is clear,that we must work together to make sure our air is fit ___ A.to be breathed

One thing is clear,that we must work together to make sure our air is fit ___ A.to be breathed

题目
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
答案
选B.be fit to do sth 适合做某事.不能用被动.我是英语专业的,
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