he was reported to have covered 30 miles on foot that day.为什么用have done?
问题描述：
he was reported to have covered 30 miles on foot that day.为什么用have done?
既然是报道之前就走完了 那为什么不用过去完成时呢？
答
因为在report之前,他走了30 miles,这里有个时间的先后顺序.在报道之前,他就已经做了某件事,所以用了完成时.译：据报道,那天他步行走了30公里.也可以改成下面的,或许会更好理解.It was reported that he had covered ...