【正确答案】 C

【答案解析】[听力原文]
   W: Bright Star Hotel.
   M: Good afternoon. My name is Martin. I'd like to book some rooms for tomorrow for a week.
   W: OK. What kind of rooms would you like?
   M: Two single rooms and three double rooms.
   W: Sure, we have single rooms at $30, $40 a night and double rooms at $40, $50 a night.
   M: Fine. I would like single rooms at $40 and double rooms at $50.
   W: So, two single rooms at $40 a night and three double rooms at $50 a night.
   M: Yes, that's right. Thank you.
   W: You're quite welcome.
   How long does the man book the rooms?
[考点] 细节题
问题问的是男士要预订多长时间。根据男士所说I'd like to book some rooms for tomorrow for a week可知，男士要住一周，也就是7天。故选C。