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问题: 选什么? 为什么?

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

解答:

B
air和breathe在逻辑上是动宾关系,所以选B
就比如你肯定很熟悉的句子:I have much homework to do.
注意区分have sth. to be done
此句型强调由他人来做某事,例如I had my hair cut.是让别人来帮自己剪头发。
本句中,我夏天喜欢早起,早晨的空气很清新。是自己去呼吸,不同于下面的句子。