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    Martin Cooper , a US researcher , was considered the first cell phone . A. invented B. to invent C. having invented D. to have invented 【查看更多】

     

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     Martin Cooper , a US researcher , was considered _______ the first cell phone .

      A. invented    B. to invent   C. having invented   D. to have invented

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    Martin Cooper, a US researcher, was considered           the first cell phone.

    A．invented           B．to invent          C．having invented              D．to have invented

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