I agree that the text is meant to be talking of something happening now: hence, ' is '. However, the verb 'has been' throws a monkey wrench into the time scheme and makes ' was ' an equally logical choice.
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Mister MicawberI agree that the text is meant to be talking of something happening now: hence, 'is'. However, the verb 'has been' throws a monkey wrench into the time scheme and makes 'was' an equally logical choice.What was as remarkable as the development of the Compact Disc is the use of the new technology to revitalize...