Martin Cooper , a US researcher , was considered the first cell phone . A. invented B. t——青夏教育精英家教网—

摘要： 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

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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