题目内容

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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