问题
选择题
| Every evening after dinner, if not _____ from work, I will spend some time walking my dog. |
A. being tired B. tiring C. tired D. to be tired |
答案
答案：C
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| Every evening after dinner, if not _____ from work, I will spend some time walking my dog. |
A. being tired B. tiring C. tired D. to be tired |
答案：C
酚类 -OH 
羧酸 -CHO 
醛类 -CHO 