“have been doing” 才是现在完成进行时.如“She has been writing the letter since two hours ago.”两个小时以来,她一直都在写信.而“having been done”是现在分词完成时的被动式,表示该动作发生在主句动作之前已经做完.这里考察非谓语动词的用法,“the words”是被藏的,用过去分词的形式即可,相当于一个被省略的定语从句,补全为“Tom looked at Jenny,tears filling his eyes,and shouted out the words（which were）hidden in his heart for years.”后置定语不可以用“having been done”的形式.谢谢.