A、He was doing shopping. B、He was watching a film. C、He was making a phone call. D、He was talking to a policeman. A短文开头就说约翰“那时正在

One day, John was doing some shopping in the market when he noticed a beautiful young woman there. She was very well dressed and he watched her as she walked round, looking at the fruit and vegetables which were for sale. The market was very crowded, but this woman was so graceful that she stood out in the crowd. "She looks like a film star," thought John to himself. Suddenly a thief ran through the crowd and seized the woman’s bag and ran away. She screamed. John ran as quickly as he could to the nearest phone box. He dialed 999. "Please, come to the market square at once," he asked the police, "A thief has run off with a lady’s bag." John then returned to the market to try to calm the young woman. However, the thief had already returned and was talking to the young woman. They explained to John that they were only making a film.
19. What was John doing when he saw the young woman?
20. What made the woman stand out in the crowd?
21. Why did the thief return?