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没人知道事故是什么时候发生的。
No one knows when the accident took place.
youdao
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你认为事故是什么时候发生的？
When do you think the accident happened?
youdao
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交通事故是什么时候发生的？
When did the car accident happen?
youdao
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事故是什么时候发生的？
When did the accident happen ?
youdao
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交通事故到底是什么时候发生的？
When was it that the traffic accident took place?
youdao
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交通事故到底是什么时候发生的？
When was it that the traffic accident took place?
youdao