_______ so busy, he would have come to help you．

A．Had my brother not                                     B．Was my brother not

C．If my brother had not been                          D．if my brother was not

________ so busy, he would have come to help you．

1. A.
   Had my brother not
2. B.
   Was my brother not
3. C.
   If my brother had not been
4. D.
   if my brother was not

Last Friday my brother and I were driving home and had a fun conversation. So absorbed in our talk, my brother took a wrong turn.
Unfortunately, the wrong turn took us towards a  31 , and we had no way to turn  32 . __33 my brother paid the bridge fee and drove on. He was greatly  34 by his mistake and the needless   35  of $4.
We eventually reached an exit, and as we took it, my brother noticed a young fellow  36 over to the side. He came out of his car and tried to  37 someone. I was busy trying to   38 which way we would go next, but my brother stopped and asked the guy if he needed any  39 And he did. He had a flat tire and needed a tool to get it off.
My brother gave him a wrench（扳手）, and then helped him  40 the flat. The young man said that this had been a  41 week for him: earlier he had gotten into a minor car  42 , and now this tire was flat on his way home from work. But he called us “a breath of fresh air’’ and kept   43  us because he really would have been   44  if we hadn’t come along.
After we had finished the job, he thanked us again and pulled out $20 to give us. “No,” my brother said. “We were never  45 to even get on that bridge. We took a wrong turn. But now we know  46  we did. It was to help you. Thank you for turning our mistake into a（n）  47 to serve.”
What I loved most was  48 my brother throughout this process. He was able to turn his mistake into 49 energy to help others even in a negative situation, which could only come from a calm mind and an open  50 .

Last Friday my brother and I were driving home together after doing some shopping and gave our attention to an interesting conversation. Because of this distraction (分心)my brother took a wrong turn.
Unfortunately, the wrong turn took us towards a bridge and we had no way to turn back. Unwillingly, my brother paid the bridge fee and drove on. He was clearly frustrated by the mistake and the needless waste of $4.
We eventually reached an exit and, as we took it, my brother noticed a young fellow pulled over to the side of the road. He came out of his car and tried to phone someone. I was busy trying to figure out which way we would go next but my brother pulled over and asked the guy if he needed any help. And he did. He had a flat tire and needed a tool to get it off.
My brother gave him a wrench, and then began to help him change the flat. The young man said that this had been a bad week for him: earlier he had gotten into a minor car accident, and now this flat on his way home from work. But he called us “a breath of fresh air” and kept thanking us because he really would have been stuck if we hadn’t come along.
After we finished the job he thanked us again and pulled out $20 from his pocket and tried to give it to us. “No,” I said. “We were never supposed to even get on that bridge,we took a wrong turn. But now we know why we did. It was to help you. Thank you for turning our mistake into an opportunity to serve.” 
What I loved most was that my brother was able to see a chance to help. His reaction in the situation is a lesson for everyone and we felt so good the rest of the day.
【小题1】When did the author and his brother notice the young man who had a flat tire?