We began swimming towards the voice, but as we were swimming, I lost all the strength I had left, and soon was underwater when I felt a strong arm again carry me to the surface.
上面句子中的定语从句 I had left 其中的left是谓语动词还是过去分词作宾补。我觉得是谓语动词,因为是过去完成时态,“lost”之前就留下的。比如,谓语动词句型:I had left all the strength。宾补句型:I had all the strength left。不知对否?