现有一块长轴长为10dm，短轴长为8dm，形状为椭圆的玻璃镜子，欲从此镜中划一块面积尽可能大的矩形镜子，则可划出的矩形镜子的最大面积为______．

When I called you this morning, nobody answered the phone,          ?

A．where were you

B．where did you go

C．where have you been

D．where have you gone