when l came into the room,they_were planning_to __go on a trip_.为_英语解答

when l came into the room,they_were planning_to __go on a trip_.为什么填were planning和go on a
trip.中文原因

人气：480 ℃　时间：2020-03-21 09:15:40

解答

go on a trip 去旅行固定短语
整个句子是一个过去进行时指过去某一时间正在做某事
当我走进房间时他们正在计划去旅行