——How often do I need to feed the dog?
——It___food everyday, or it will be hungry.
A．must giveB．must be giveC．must be given D．must be gave
C
句意：我需要多久喂一次這條狗？——必須每天喂它，否則它會餓的。結合語境可知下文主語it是動作對象，故用被動語態(tài)，選項BD過去分詞形式有誤，故選C。
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