Much of the carnage of elephants, giraffes, and big cats must have been committed by uncaring hunters.
The passive voice generates a sentence in which the subject is given an action. In contrast, active voice creates a sentence in which the subject does something.
The given sentence is in passive voice and can be written as "Much of the carnage of elephants, giraffes, and big cats must have been committed by uncaring hunters."
Thus, the correct answer is must have been committed.
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