Computers can do nothing.But once what to do, they show extraordinary power to do a great deal.
A. to program
B. being programmed
C. programmed
D. having programmed
网友回答
A. to program
B. being programmed
(答案→)C. programmed
D. having programmed
解析:考查非谓语动词。动词program和逻辑主语they之间是动宾关系,且program发生在主句动词之前,要用过去分词表被动和完成,所以选C。