ThomasAlvaEdisondidn’tinventth

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Thomas Alva Edison didn’t “invent” the light bulb (灯泡), 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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A．in place

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C．over seven times	D．seven times

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