题目内容
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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