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    (   ) 3.——Lucy, what's this?

        ―It's a CD. It       learning English.

    A. is used for    B. is used as

    C. is used to    D. is used by

    3. A be used for doing sth.意为"被用来做某事"。

    题目来源：仁爱英语同步练习册九年级上册下册合订本 > Topic1 When was it invented?

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