(单选) When did Baidu's unmanned vehicle appeared in public for the first time?(). A: December thirteen, twenty fifteen B: December fourteen, twenty fifteen C: December fifteen, twenty fifteen D: December sixteen, twenty fifteen

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(单选) When did Baidu's unmanned vehicle appeared in public for the first time?(). A: December thirteen, twenty fifteen B: December fourteen, twenty fifteen C: December fifteen, twenty fifteen D: December sixteen, twenty fifteen

(单选)
When did Baidu's unmanned vehicle appeared in public for the first
time?().
A: December
thirteen, twenty fifteen
B: December
fourteen, twenty fifteen
C: December
fifteen, twenty fifteen
D: December
sixteen, twenty fifteen

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(单选)<br/>When did Baidu's unmanned vehicle appeared in public for the first<br/>time?(). A: December<br/>thirteen, twenty fifteen B: December<br/>fourteen, twenty fifteen C: December<br/>fifteen, twenty fifteen D: December<br/>sixteen, twenty fifteen

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