单选题 My pain ______ apparent the moment I walked into the room, for the first man I met asked sympathetically: "Are you feeling all fight?"
  • A. must be
  • B. must have been
  • C. had been
  • D. had to be


【正确答案】 B
【答案解析】[解析] 考查情态动词用法。must have done表示对过去某事的肯定推测，常译成“一定是……”，故选项B为正确答案。