单选题：Which of the following statements is true of robotic drivers

题目分类：理工类
题目类型：单选题
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题目内容：

Which of the following statements is true of robotic drivers? A．It will take some time before robotic drivers are available.
B．Robotic drivers are. not allowed to drive on busy roads.
C．Robotic drivers can never replace human drivers.
D．Robotic drivers are too expensive to use.

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答案解析：

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