单选题 —Hey, look where you are going.
   —Oh, I'm terribly sorry. ______.
   A) I'm not noticing                    B) I haven't noticed
   C) I wasn't noticing                    D) I don't notice
【正确答案】 B
【答案解析】notice和go的动作有先后顺序，没有注意到在前，走错方向在后。