when a railroad was first invented ,on one__________that one

when a railroad was first invented ,on one__________that one day this simple idea would change the world A could know B could have known C could know D should have known
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xuetao507 春芽

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应该是D
意思是:当一条铁路第一次被发明出来时,有人就应该已经知道总有一天这个简单的想法将会改变世界.

1年前

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