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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：句意：钥匙是用来开门上的锁的。A结构不完整，故错误。B be used to do 被用来做……，单选项不完整，故不正确。C be used to do 被用来做···，to后加动词原形，结合句子结构也不正确Dbe used for doing sth,被用来做……。故选D。

    考点：考查词义辨析。

     

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