On Mars,there is no pollution ___ by traffic.A is caused B c

DoggieFish2022-10-04 11:39:542条回答

On Mars,there is no pollution ___ by traffic.A is caused B caused C that caused D that are caused

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xulian616 共回答了12个问题 | 采纳率91.7%: B caused ,因为这里是定语从句的省略,完整的句子应该是：
there is no pullution which/that is caused by traffic;; 1年前

ILDGT 共回答了104个问题 | 采纳率: B，过去分词做定语; 1年前

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