这里为什么用完成时？

Perhaps, there is an element of truth in both these pictures, but few of us have had the opportunity to find out.

　　新概念3-12: Perhaps, there is an element of truth in both these pictures, but few of us have had the opportunity to find out.

　　为什么是"have had the opportunity "？

　　自己写的话,肯定是few of us have the opportunity to find out

　　Perhaps, there is an element of truth in both these pictures, but few of us have had the opportunity to find out.

　　用完成时表示,到现在为止还没有机会。可以体会到说话的人已经有过试着去发现的动作了,或者一直有人在尝试,只是还没有人成功。

　　用一般时表示说话人的一种判断,主观地认为不会有机会发现事实。