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
省略句式。在if引导的条件状语从句中，从句中还原应为if I am not tired from work，根据省略的原则，所以选C。
H2S+2OH-