单项选择题
[听力原文] W: Can I have a single room for a night, please M: Sorry, madam. All our rooms are occupied.
A.At a restaurant. B.At a hotel. C.At a post office. D.At a caf
A. When we saw it B. Having seen C. Seeing D. Seen
A. I know B. I knew C. do I know D. did I know