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    Metal ________ make machines and many other things.

    [　　]

    A．used to
    B．is used for
    C．is used as
    D．is used to

    答案：D
    解析：

    点拨：金属被用来制作机器和许多其他的东西。used to意为“过去常常”；be used for“被用来做”，但for后跟v. -ing；be used as意为“被用作”；be used to意为“被用来做”，其后跟动词原形，故选D。


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