[单项选择] Questions 14 to 17 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now, listen to the passage. Which of the following statements is TRUE about the speaker A. He has always lived in America. B. He has been in America for three years. C. He visited America three years ago. D. He has come to America to do research on advertisin