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    ( ) The battery-operated slippers are used for in the dark. A. seeing B. see C. saw D. sees 【查看更多】

     

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    －What are those?

    －They are battery-operated slippers. They ________ in the dark.

    [　　]

    A．used to see
    B．are used for see
    C．are used to see
    D．used for seeing

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