Unless they are programmed by humans, computers are nothing more than big pieces of metal. But once _____ what to do, they show extraordinary power in carrying it out.  A. taught  B. teaches  C. teaching  D. to teach

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题目内容（兰州财经大学-大学英语）

Unless they are programmed by humans, computers are nothing more than big pieces of metal. But once _____ what to do, they show extraordinary power in carrying it out.
 A. taught
 B. teaches
 C. teaching
 D. to teach

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