—Yes. I ______ in Taian for a week last year and reached the top of it twice.
A:had stayed
B:stay
C:stayed
D:have stayed
平面直角坐标系中,△ABC的BC边平行于x轴,BC=2,点A的坐标为(﹣4,3),点B的坐标为(﹣3,1).