原句应该是
I was surprised to see that he is still as fat as ever...
在这个句子当中,谓语是“be surprised to see”,后面跟宾语,因为是个句子,所以叫宾语从句,而且在宾从中句子要用陈述句的语序,“he is still as fat as ever”这句就是陈述句的语序,即主谓宾,所以这肯定是个宾语从句.