ThomasAlvaEdisondidn’tinventth

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更新 2022-09-03
科目英语
题型单选题
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挑错有奖

Thomas Alva Edison didn’t “invent” the light bulb, but rather he ______ a 50 –year –old idea, which is not well –known.

A．improved upon

B．take down

C．put up

D．break away

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