The two old sisters so long held each other and burst into tears. A. being separatedB.

问题补充：

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

答案：

A. being separated

(答案→)B. having been separated

C. having separated

D. had been separated

解析：考查非谓语动词。Separate与句子主语The two old sisters为动宾关系与谓语动词held为先后关系故用现在分词的完成被动式作状语。句意：分离很长时间后这两位老姐妹拥抱在一起热泪盈眶。