M：Do you know what happened to me today?Iwas SO embarrassed．
W：What?
M：Well，Dr．Brown’s ass finished lo minutes early，so I went to the library between classes．I knew I didn’t have  much time，but l wanted to get these books on the Industrial Revolution．I looked them up in the card catalogue  and went right to the stack and found them．So I put them in my book bag and headed back towards the door．Then  it happened．The exit gate in front of the door wouldn’t open．and the guard immediately warned me that I hadn’t checked out my books．He thought l was trying to steal them．
W：That must have been embarrassin9．But why did not the exit gate open?
M：I asked them that．It seems that the books in the library are all magnetically coded，and when you check them out，  the librarian behind the desk demagnetizes them，then the exit gate will open．
W：How interesting!I still don’t quite understand how they do it．though．rll have to go to the library and see it for  myself．
解析
How was the boy feeling when that happened?
细节题。男孩的第一句话就说Doyouknowwhathappenedtometoday?1was SO embarrassed．表明男孩要讲述今天发生在他身上的事情。紧接着他说他很尴尬。也就是说无论这件事情是什么，都让他觉得尴尬。因此，正确答案为A。