◎ 题干
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
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“ His essay, ____many times,was brief and to the point,and therefore won the first prize in the writing competition.A.polishing upB.having polished upC.to be p…”主要考查了你对  【现在分词的被动式】【现在分词】【不定式的被动式】【过去分词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。