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This research investigated the problem of air pollution (cause) ________by vehic
This research investigated the problem of air pollution (cause) ________by vehic
游客
2023-09-19
13
管理
问题
This research investigated the problem of air pollution (cause) ________by vehicles in the city of Tripoli, Libya.
选项
答案
caused
解析
空格所填词汇修饰名词air pollution“空气污染”,应用所给提示词的过去分词形式作后置定语,故用caused。
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