已知点A 与点B(x ，y) 关于y 轴对称，则点A 关于原点的对称点C 的坐标是﹙    ﹚.

–-Where is Mr Jackson?

-- He         in the park. He        there every Sunday afternoon.

A．walks; walks

B．walks, is walking

C．is walking; walks

D．is walking; is walking