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    (   ) 1. ―Could you tell me when the digitalcamera______ ？

           —In the 1970s.

    A. was discovered    B. is discovered

    C. was developed    D. is developed

    1.C 数码相机是在普通相机基础上改进而成的。

    题目来源：仁爱英语同步练习册九年级上册仁爱版 > Topic1 When was it invented?

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