Questions 14 to 17 are based on the following passages. At the end
of the passage, you will be given 20 seconds to answer the questions. Now,
listen to the passage. Dr. Sheeler was surprised at Mr. Nelson’s call because ______.
A．the new patient should not have known his phone number B．he seldom called at night C．the Nelsons had been very healthy D．the Nelsons had not called him for a long time