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
考查非謂語動詞。動詞program和邏輯主語they之間是動賓關(guān)系，且program發(fā)生在主句動詞之前，要用過去分詞表被動和完成，所以選C。
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