My pain obvious the moment I walked into the room for the first man I met asked me pitif

问题补充：

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

答案：

A. must be

(答案→)B. must have been

C. could be

D. could have been

解析：本题是情态动词的考查。根据后半个分句可以知道谓语动词发生于过去，而情态动词+动词的完成式表示对过去的推测。