题目内容
——How often do I need to feed the dog?
——It___food everyday, or it will be hungry.
A．must give B．must be give C．must be given D．must be gave
【答案】
C
【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。
考点：被动语态
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