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10.When ________,the project will help to greatly improve the air quality in the community.(  )
A.finishingB.to finishC.finishD.finished

分析 完工以后,该工程将有助于极大改善该社区的空气质量.

解答 答案:D
解析:根据句意可知,前一分句的完整形式为一个由when引导的时间状语从句:When it (the project)is finished;因为从句与主句的主语一致,且从句中含有be动词,故可以省略从句的主语和be动词,而只保留过去分词finished.

点评 本题考查过去分词,做此类题目时一定要仔细分析句子结构,确定句子所缺成分以及该成分由什么来充当,再结合所给选项选出最终答案.

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