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(   ) 1. —Could you tell me when the digital camera      

      —In the 1970s.

A. was discovered    B. is discovered C. was developed    D. is developed 

l.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下册合订本 > Topic1 When was it invented?

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