【单项填空】 —It is said that the man lived alone on the lonely island for about 3 months before he was saved. —Really? He________a lot of difficulties! A．may go through B．might go through C．ought to have gone through D．must have gone through 解析　本题考查情态动词。由句意“据说那人在获救前孤身一人在一座孤零零的岛屿上生活了近3个月”可以推测，他一定经历了许多困难。表示对过去情况的推测用must have done的形式。 答案　D