【题目】What can we learn about the man?
A. He is anxious to see his sister.
B. He wrote to his sister last month.
C. He is expecting a letter from his sister.
在线课程【答案】C
【解析】
M: I haven't heard from my sister since last month.
W:Don't worry, Charlie. Letters from the United States can be slow sometimes.
此题为听力题，解析略。