A:①;②和③
B:②;③和④
C:②;①和③
D:④;①和②
He had hoped to have an opportunity to travel abroad for long. But it was a(n) ______ that he missed it when it came last month.
如图,点A、B的坐标分别为(0,3)、(4,6),点P为x轴上的一个动点,若点B关于直线AP的对称点B′恰好落在坐标轴上,则点B′的坐标为____
____、____、____、____