2. 外语
  3. This research investigated the problem of air pollution (cause) ________by vehicles in the city of Tripoli, Libya.

This research investigated the problem of air pollution (cause) ________by vehicles in the city of Tripoli, Libya.

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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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