单项选择题
Bill: Hello, Mary. Why are you standing here in the cold wind
Mary: (), but buses are very full at this time of the day.
Bill: Where are you going This isn’t your way home.
Mary: But I’m not going home now. I’m going for a walk in the park.
A. I’m going home
B. I’m going to work
C. I’m waiting for somebody
D. I’m waiting for a bus