求助，主系表结构有没有完成时态？

亲爱的敌人

Bengal-born writer, philosopher, and educator Rabindranath Tagore had the greatest admiration for Mohandas K. Gandhi the person and also as a politician, but Tagore had been skeptical of Gandhi's form of nationalism and his conservative opinions about India's cultural traditions.

• Afor Mohandas K. Gandhi the person and also as a politician, but Tagore had been  
• Bfor Mohandas K. Gandhi as a person and as a politician, but Tagore was also  
• Cfor Mohandas K. Gandhi not only as a person and as a politician, but Tagorewas also  
• Dof Mohandas K. Gandhi as a person and as also a politician, but Tagore was  
• Eof Mohandas K. Gandhi not onlyas a person and as a politician, but Tagore had also been  
  

比如OG中的这道题，这里用过去完成时肯定是错的，但是楼主想知道sb had been /have been+adj 这种结构在语法上是否正确，因为感觉平时都没有读到这样的句子

但是we are friends    /  we have been friends 这种结构又比较常见

不知道我的表述有没有清晰，求大神们帮助啊

亲爱的敌人

upupupupupupu

上汤胡萝卜

主系表结构是：主语+系动词+表语,满足这个结构的都是~这个结构本质上应该是是适用于任何时态的，主要还是看在句子里具体情况是什么。
楼主你说的现在完成时的：We have been friends for many years.这里之所以可以用完成时的原因是后面这个时间状语。

这个是prep的语法笔记上讲到的现在完成时的用法
within/during/in/over+ the past/recent/last+时间段(注意during/in/over the last year可以用现在时也可以用完成时，取决于当时发生的事情是否延续到现在或对现在是否还有影响，而last year用过去时)

至于过去完成时的话一定要在句子里发现明显的表示过去的词语，比如：OG16-Q27

In the seventh century B.C., the Roman alphabet was adapted from the Etruscan alphabet, which in turn had been adapted in the previous century from a western Greek alphabet, which itself had been adapted earlier in the same century from the Phoenician alphabet.
A.which itself had been adapted earlier
B.adapting itself earlier  
C.itself being adapted earlier
D.having been earlier adapted itself  
E.earlier itself having been adapted  
这里用过去完成时的原因就是因为之前的adapted已经是过去发生的了

不知道讲的有没有问题！求拍砖！