A、Three years ago. B、This year. C、Last year. D、In December. B女士讲到去年她本打算12月去黄石公园，但是推迟了几个月才去，由此可知她是今年去的。

W: These are very nice shirts. How much are they?
M: 15 Dollars each, two for 28 dollars. They are on sale.
Q: How much do four shirts cost?

M: You’ve been here three years. Have you had much of a chance to travel?
W: Not much. Last year, I planned to go the Yellow Stone Park in December. But I had to postpone the trip. Then, a few months later, I finally made it there.
Q: When did the woman go to the Yellow Stone Park?