這裡爲什麽用完成時？

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

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

　　爲什麽是"have had the opportunity"？

　　自己寫的話,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.

　　用完成時表示,到現在爲止還沒有機會。可以躰會到說話的人已經有過試著去發現的動作了,或者一直有人在嘗試,衹是還沒有人成功。

　　用一般時表示說話人的一種判斷,主觀地認爲不會有機會發現事實。