TwowitnessessaidthattheUFO____

发布时间：2020-07-28 13:36:04

Two witnesses said that the UFO ________ from north to south when they saw it．A.was travelingB.traveledC.had been traveledD.had traveled

网友回答

A解析从“when they saw it”可知应用过去进行时。
以上问题属网友观点，不代表本站立场，仅供参考！