听下面一段对话,回答第1-3 小题。 1. How many times has Jack visited London before? [ ] A. Five times. B. Twice. C. Never before. 2. When will Jack have to return? [ ] A. In two days. B. In three days. C. In four days. 3. What does Jack think of London? [ ] A. He thinks it's a wonderful place. B. He doesn't like here. C. He doesn't think it's a wonderful place.