专四的一道语法题
问题描述：
专四的一道语法题
There seemed little hope that the explorer,having been deserted in the tropical forest,would find his way through it.
这道题是所谓的表原因的分词完成时,但是意思我看不懂,也不知道为什么这里会用上完成时,怎么解释这里的完成时
答
被遗弃于热带雨林的探险家不可能找到出去的路.
having been 修饰 explorer 其时态在seemed的过去时态之前.