长期以玉米为主食的地区，加入10%黄豆，对预防癞皮病有重要意义。( )
参考答案：对
Only when I made it to the train station _______ that I had left my ticket at home.
A．have I realized
B．did I realize
C．had I realized
D．would I realize
实行市场经济的国家也就是金融自由化的国家。（）
