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题目内容
（武汉科技 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.（1分）
Ataught
Bteaches
Cteaching
Dto teach
Ataught
Bteaches
Cteaching
Dto teach
参考答案
