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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 容易
  • 浏览 841

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
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Hisessay,manytimes,wasbriefand