His essay, ____many times,was brief and to the point,and the

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
pangzi2006 1年前 已收到1个回答 举报
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D

having been polished up为现在分词完成式的被动式，作定语修饰essay。根据后面的内容可知，他的文章已获得了一等奖，而polish up (修改，润饰)应是在此之前，故用其完成式。句意为：他的文章，经多次修改后，简洁而又切题，因此在作文比赛中赢得了一等奖。

1年前

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