When Wang Fang wants to finish her visit to Tom Smith, her tutor, she can say: 
A I have nothing to say, so, good-bye.
B I’ve wasted a lot of your time.
C Sorry to have interrupted you for so long.
D I really have had a good time. Good bye.
When Wang Fang wants to finish her visit to Tom Smith, her t - Chapter 5 Daily Verbal Communication in English and Chinese - 英汉语言与文化 - 安徽省网络课程学习中心平台 | 大学网课搜题引擎