单项选择题
Questions 23 and 24 are based on the following news. At the end of the news item, you will be given 10 seconds to answer the questions. Now, listen to the news.
According to the news, the US troops are expected to completely pull out by（）
A．mid-2009.
B．the end of 2009.
C．mid-2011
D．the end of 2011.