When it was eventually brought to shore,it was found to be over thirteen feet long.关于主句的时态

问题描述:

When it was eventually brought to shore,it was found to be over thirteen feet long.关于主句的时态
it was found to be是不是应该改成it had been found to be么?
过去的过去不是应该用过去完成时吗?

这句话的意思是”当它最后被拖上岸时,人们发现它有13英尺长“.这句话主从句时态协调一致,是正确的.因为拖上岸和发现几乎同时进行,所以,应该用一样的时态--一般过去时.再比如:When I entered the room, I found that...