选c是对的.
你没有搞明白句子的结构.The program to be put into the computer是句子的主语,中心语是The program,to be put into the computer是后置定语用来修饰它的.还有to be表示一种将来的动作,而was put表示的则是过去的动作,不符合句意.
另外主语从句必须有引导词that
选B错么?The program ____ into the computer must be prepared in
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