题干
Beijing and Zhangjiakou applying to host the 2022 Winter Olympic Games in 2013.
A：begin
B：began
C：have begun
D：had begun
答案(点此获取答案解析）
B
Beijing and Zhangjiakou applying to host the 2022 Winter Olympic Games in 2013.
A：begin
B：began
C：have begun
D：had begun
