题目内容

Keys _______ opening the lock in the door.
A．used forB．are usedC．are used toD．are used for
D

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.
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