This research investigated the problem of air pollution (cause) ________by vehic

游客2023-09-19 40

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。

转载请注明原文地址:https://www.tihaiku.com/zcyy/3026802.html

相关试题推荐

随机试题

最新回复(0)

Dotheresultsoftheresearchhaveanypractical(apply)______?application这一研究