单选题：What 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：

What is true of robotic drivers? A．It will take some time before robotic drivers can be put to practical use．
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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