——How often do I need to feed the dog?——Itfood everyday or it will be hungry.A. must give

问题补充：

——How often do I need to feed the dog?

——Itfood everyday, or it will be hungry.

A. must give

B. must be give

C. must be given

D. must be gave

答案：

A. must give

B. must be give

(答案→)C. must be given

D. must be gave

解析：句意：我需要多久喂一次这条狗？——必须每天喂它，否则它会饿的。结合语境可知下文主语it是动作对象，故用被动语态，选项BD过去分词形式有误，故选C。