The two old sisters， so long，held each other and burst into tears．
A. being separated
B. having been separated
C. having separated
D. had been separated
网友回答
A. being separated
(答案→)B. having been separated
C. having separated
D. had been separated
解析： 现在分词的完成被动式作原因状语，说明发生在谓语动词所表示的动作之前的被动动作。