一个句子,有点搞不懂

问题描述:

一个句子,有点搞不懂
It was true that if this accident had not happened,Jim _____would be found _____himself sitting in the classroom enjoying his class.
为什么这里要用被动 他被发现他自己?
这是高三课本上的一个题,答案给的是would be found

答案错了
Jim would have found himself sitting in the classroom enjoying his class.