你的问题有点复杂，语法书上对这类问题好像也讨论得比较少。下面我谈谈个人的看法（不一定对，仅供参考）：

▲如果副词是修饰整个谓语部分，则通常放在being之前，即采用“be+副词+being+过去分词”这样的句式。如：

This problem is now being looked at by some of the ablest minds / scientists in the country. 现在国内一些最有才干的人或科学家正在研究这个难题。

The album is finally being released in October after gathering dust for over a year. 尘封了一年多后，专辑终于在 10 月发行。

I was gradually being brought face to face with the fact that I had very little success. 我渐渐开始面对这个事实，那就是我几乎一事无成。

说明：其实这样用的副词通常也可放在句首或句末。

▲如果副词是侧重修饰其中的过去分词，则通常放在过去分词之前，即采用“be+being+副词+过去分词”这样的句式。如：

The airport is being privately funded by a construction group. 该机场是由一个建筑集团私人出资兴建的。

She’s been told that her husband is being harshly treated in prison. 她被告知自己的丈夫正在监狱里遭受虐待。

Safety procedures are being urgently reviewed after a chemical leak at the factory. 工厂发生化学药品泄漏后，目前正在紧急检查安全程序。

Documents leaked to this newspaper purport to reveal that radioactive waste is being illegally dumped on the site. 透露给报纸的文件声称是揭露放射性废料正被非法倾倒到此地一事。

I would like to know why we pensioners are being so badly treated. 我想知道为什么我们这些领养老金的人受到如此恶劣的对待。

说明：由于语法现象千变万化，说话者的出发点、侧重点以及所表达的意思各不相同，所以这样的问题其实很难有固定的模式的，有时副词的位置可以比较“灵活”。如：

Cells are being constantly renewed. 细胞不断再生。

We are constantly being reminded to cut down our fat intake. 不断有人提醒我们要减少脂肪的摄入量。

The distinction between social classes is slowly being eroded. 社会阶级差别正慢慢消失。

Its historic buildings are being slowly and splendidly renovated. 此处的历史建筑正被缓慢且精心地修复着。

注：由于语法现象千变万化，说话者的出发点、侧重点以及所表达的意思各不相同，所以这样的问题其实很难有固定的模式的，上面的解答只是个人看法，不一定对，仅供参考！