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，該工程將有助于極大改善該社區(qū)的空氣質(zhì)量．

解答 答案：D
解析：根據(jù)句意可知，前一分句的完整形式為一個由when引導的時間狀語從句：When it （the project）is finished；因為從句與主句的主語一致，且從句中含有be動詞，故可以省略從句的主語和be動詞，而只保留過去分詞finished．

點評 本題考查過去分詞，做此類題目時一定要仔細分析句子結(jié)構(gòu)，確定句子所缺成分以及該成分由什么來充當，再結(jié)合所給選項選出最終答案．

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