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It's thought that the accident was caused by human error.
The accident is ___________________________________________________________________
![](https://image.exam24h.com/public/2019/04/27/1052_7aac21b01db4e7fe0a14cbd404824ec0_300x300.jpeg)
It's thought that the accident was caused by human error.
The accident is ___________________________________________________________________
The accident is thought to have been caused by human error.
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