第7题: [单项选择]My pain ______ apparent the moment I walked into the room, for the first man I met asked sympathetically: "Are you feeling all right " A. must be B. must have been C. had been D. had to be 参考答案:B 答案解析:语法结构题。本句的意思是:我刚走进房间时一定表现得很痛苦,因为我遇到的第一个人同情地问我:“你没事吧 ”本句的难点:must与完成时不定式连用往往表示对过去发生的事情的主观推测。