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[主观题]
Unless they are programmed by humans, computers are nothing more than big pieces of me
tal. 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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tal. But once __ what to do, they show extraordinary power in carrying it out.
A. taught
B. teaches
C. teaching
D. to teach