He could hardly believe his eyes

问题补充：

He could hardly believe his eyes,

答案：

选 D hardly 表示否定 所以反义疑问句用肯定的形式

======以下答案可供参考======

供参考答案1:

D有不明白的地方再问哟，祝你学习进步，更上一层楼！ (*^__^*)

供参考答案2:

选Dhardly否定副词反意疑问句遵循“前否后肯”原则故排除A&B 句子前用could 故选D