I like getting up very early in summer. The morning air is so good . A. to be breathedB.

问题补充：

I like getting up very early in summer. The morning air is so good .

A. to be breathed

B. to breathe

C. breathing

D. being breathed

答案：

A. to be breathed

(答案→)B. to breathe

C. breathing

D. being breathed

解析：考查非谓语动词。breathe的逻辑主语是I，I与breathe是主谓关系，不能用被动，排除A、D。动词不定式可以跟在某些形容词或动词后作原因状语。故选B。