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
，且
的最大值为2,其图像相邻两对称轴间的距离为2，并过点（1,2）．则
="( " )