问题
选择题
Although ______ for many years, the two old sisters recognized each other at once.
A．having been separated
B．being separated
C．having separated
D．had been separated
答案
答案：A
A考查非谓语动词用法。前后主语一致并且前边动作发生在后面的动作之前，故用现在分词的现在完成时。