新概念英语第三册 12课 一句话语法提问

题目

新概念英语第三册 12课 一句话语法提问
Most of us have formed an unrealistic picture of life on a desert island.We sometimes imagine a desert island to be a sort of paradise where the sun always shines……The other side of the picture is quite the opposite.……Perhaps there is an element of truth in both these pictures,but few us have had the opportunity to find out.
我想问最后一句：few us have had the opportunity 为什么是have had?直接用have不就好了么?

答案

few of us have had the opportunity .我们很少有这样的机会.（have had说的是以前,以后作者不能断定,所以没有用“have”）
希望有所帮助.