题目

I didn't like playing football _______. I like it very much _______. I will be a football player _______. A . now; before; in the future B . before; now; in the future C . in the future; now; before 答案：B抛物线y=x2-6x+5的顶点坐标为（ ）A．（3，-4）B．（3，4）C．（-3，-4）D．（-3，4）