单项选择题

Questions 4 to 7 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions. Now listen to the conversation. Why was the man worried at first

A.He couldn’t decide on a topic for his paper.
B.He thought his paper was late.
C.He hadn’t heard from his family in a while.
D.He thought the woman had been ill.