请问It is caused by heavy traffic.句子中caused是什么词性?为什么不能用canus这个

请问It is caused by heavy traffic.句子中caused是什么词性?为什么不能用canus这个 请问一个英语问题英语课本中有这个句子：...it is human activity that has caused t On Mars,there is no pollution ___ by traffic.A is caused B c caused It is quite obvious _____ has caused the traffic jam during The serious traffic accident was caused by the careless driv What is acid rain usually caused by? problems caused by deforestation I got struck in the heavy traffic这个句子中能用stuck吗 i must apologize for any inconvenience caused这个caused在这里的词性 Extracting file failed.It is most likely caused by memory (l 交通 ,题08:many traffic jams are caused by traffic accidents wi