A:①②③
B:②③④
C:①③④
D:①②④
A: You look very nice in your new dress today.B: Oh, really? I it when it was on sale.
如图,已知抛物线y=ax2+bx+c(a>0,c<0)交x轴于点A,B,交y轴于点C,设过点A,B,C三点的圆与y轴的另一个交点为D.