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the two old sisters,having been separated for years,held eac

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the two old sisters,having been separated for years,held each other and burst into tears .为什么用having been separated 不用 had been separated
the two old sisters,having been separated for years,held eac
因为separated是一个一直持续的状态,不是一个时间点完成的事~
所以用having been separated
如果用had been separated表示只在之前某个时间点分开过~并不表示持续状态
希望能帮助你理解