Keys ( ) opening the lock in the door.Keys ( ) opening the lock in the door.A.used for B.are used C.are used to D.are used for我选的是C老师给大答案是D be used to doing不是被用来做某是吗,我查词典查不到be used for?

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Keys ( ) opening the lock in the door.Keys ( ) opening the lock in the door.A.used for B.are used C.are used to D.are used for我选的是C老师给大答案是D be used to doing不是被用来做某是吗,我查词典查不到be used for?
Keys ( ) opening the lock in the door.
Keys ( ) opening the lock in the door.
A.used for B.are used C.are used to D.are used for
我选的是C老师给大答案是D be used to doing不是被用来做某是吗,我查词典查不到be used for?

Keys ( ) opening the lock in the door.Keys ( ) opening the lock in the door.A.used for B.are used C.are used to D.are used for我选的是C老师给大答案是D be used to doing不是被用来做某是吗,我查词典查不到be used for?
同学,为你

选择 D.are used for

知识点：
be used to doing 表示习惯于做某事
be used to do表示...被用来做某事
be used for doing 被用于做…

opening是ing形式的,因此选择be used for doing 被用于做…才是对的.好好看看区别.

例句：
be used to do--Knives are used to cut things.
be use for doing----Knives are used for cutting things

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