题目

He accidentally         he had quarreled with his wife and he hadn’t been home for a couple of weeks.       A．put forward         B．made out             C．came up              D．let out 答案：D已知二次函数y＝x2－4x＋5的顶点坐标为 [     ]A．（-2，-1）B．（2，1）C．（2，-1）D．（-2，1）