补全对话 A:Wow!I think Yao Ming is my favorite basketball player.
A:Wow!I think Yao Ming is my favorite basketball player.B:A:When he was a little boy.B:A:He has been playing for over ten years.B:A:His parents taught him when he's a child.B:A:They were basketball players before he's born.B:A:He plays center for the Houston in the NBA.