I am looking forward to seeing the film star她们昨天出发去伦敦了set off for怎么翻译这道题一提问就闪退。所以麻烦了动身，出发的意思她们昨天出发去伦敦了这句They set off for London yesterdayThey have set off for London yesterday 这句会错吗have要不要加啊这里不需要用完成是的因为是yesterday，用过去时就可以了