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    Keys _______ opening the lock in the door.

    A. used for????????? ????????????? B. are used??????? ????????????? C. are used to?????? ????????????? D. are used for

     

    【答案】

    D

    【解析】

    试题分析：to到，向，表示动作的对象，目的等；for为了，表示动作的目的，原因等；句意：钥匙是用来开门上的锁的。结合语境可知本句主语是动作对象，故用被动语态，本句中介词表示动作的目的和原因，故选D.

    考点：考查介词及被动语态

     

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