A、This week. B、Several weeks ago. C、Last week. D、Last month. C由男士的回答“Since last week”可知男士的呼吸不畅问题已经出现一个星期了，故选C。

W: How long have you had difficulty breathing?
M: Since last week.
W: ls it bad?
M: Yes, I feel as if I can’t get enough air.
W: Which is more difficult, breathing in or breathing out?
M: It’s harder to breathe in.
W: Are you short of breath when you’ re resting or only when you’ re doing something physical?
M: A little when I’ m resting, but it’ s worse when try to do anything physical.
W: Can you lie flat in a bed?
M: Oh, no.
W: How many pillows do you use?
M: Three.
W: Do you ever wake up at night feeling short of breath?
M: Yes, I do. It frightens me because I wake up feeling as if I can’t breathe
Q13: What is the man’ s trouble?
Q14: When did the man’ s trouble begin?
Q15: Why can’ t the man lie flat in bed?