如图,一块等腰直角的三角板ABC,在水平桌面上绕点C按顺时针方向旋转到A′B′C的位置,使A、C、B′三点共线,那么旋转角度的大小为( )
A:45°
B:90°
C:120°
D:135°
一 What happened to you? You look scared.
— Someone followed me all the way.