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His essay, many times, was brief and to the point and therefore won the first pr

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His essay, many times, was brief and to the point and therefore won the first pr

  His essay, ______ many times, was brief and to the point and therefore won the first prize in the writing competition.

  A. polishing up B. having polished up 

  C. to be polished up  D. having been polished up

 

试题答案

D