Computers can do nothing．But once ______what to do, they show extraordinary power to do a great deal．
A．to programB．being programmed
C．programmedD．having programmed
C
考查非謂語(yǔ)動(dòng)詞。動(dòng)詞program和邏輯主語(yǔ)they之間是動(dòng)賓關(guān)系，且program發(fā)生在主句動(dòng)詞之前，要用過(guò)去分詞表被動(dòng)和完成，所以選C。
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