If the president had visited the hospital this morning, it the headline in tomorrow's pap

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A. will be
(答案→)B. could be
C. had been
D. was
解析：考查虚拟语气的用法。由had visited可以判断条件状语从句里是对过去的虚拟，而由tomorrow's paper可以看出主句是对将来的虚拟，谓语应该用过去式(用be 时用were不能用was)或were to do；故选B
虚拟条件句中，主、从句的动作若不是同时发生时，须区别对待。
①从句的动作与过去事实相反，而主句的动作与现在或现在正在发生的事实不符。如：If I had worked hard at school, I would be an engineer now, too.
如果我在学校学习刻苦的话，我现在也会使工程师了
If they had informed us, we would not e here now.
如果他们通知过我们的话，我们现在就不会来这里了。
②从句的动作与现在事实相反，而主句的动作与过去事实不符。如：
If he were free today, we would have sent him to Beijing.
如果他今天有空的话，我们会已经派他去北京了。