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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

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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