Although ______ for many years, the two old sisters recognized each other at once.
A．having been separatedB．being separated
C．having separated D．had been separated
A
A考查非謂語動詞用法。前后主語一致并且前邊動作發(fā)生在后面的動作之前，故用現(xiàn)在分詞的現(xiàn)在完成時。
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