听录音，选择最佳答案。 (     )1. A. Thank you. (     )2. A. No, I didn't. (     )3. A. Very good. (     )4. A. Yes, I did. (     )5. A. We have gone to London. B. Don't say so. B. No, I haven't B. Glad to hear that. B. Very well, thanks. B. They have gone to London. C. What makes you think so? C. No, I'm not. C. Sorry to hear that. C. By bus. C. They have been to China.