. My pain obvious the moment I walked into the room, for the first man I met asked me pitifully: Are you feeling all right?
A. must be
B. must have been
C. could be
D. could have been
网友回答
A. must be
(答案→)B. must have been
C. could be
D. could have been
解析：考查情态动词的用法。句意“我一走进房间，就觉得我的疼痛是很明显的；因为遇到的第一个人关心地问道‘你没事吧？’。”must have done表示肯定的推测，因为“一定已经做了某事”。故选B。