题目

You probably know that doing good makes you feel good, whether it’s volunteer work or something for a friend. I have   41 someone else’s good deed. It also gives me a  42  attitude, especially a random act of kindness from a  ___43  . That’s been my experience anyway. My family and friends have done more than I can  44  for me, and I am very  45  . But someone I don’t even know does  46  nice for me? It’s really  47  . And that’s what makes your life wonderful. Take what happened to me Wednesday night. I  48  the office at 7:10, almost an hour later than I－Chris, why haven't you gone to the Great Wall with them? －I have already been there three times. －When ________ you ________ there? －In 1990, 1996 and 2001. [　　] A．have…beenB．did…go C．will…goD．have…gone