When a railroad was first invented, no one________that one day this simple idea

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问题 When a railroad was first invented, no one________that one day this simple idea would change the world.

选项 A、could know
B、should have known
C、would know
D、could have known

答案 D

解析当铁路最初被发明出来时，没有人能想到有一天这个小小的想法竟然能够改变世界。虚拟语气题。When引导的从句是时间状语从句，陈述的是过去的事实。主句用了虚拟语气，指过去那个时候没有人能够想到，所以用could have known，所以D项为正确答案。

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