The old man ____ before the doctor arrived.had died died is dying dies

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The old man ____ before the doctor arrived.had died died is dying dies
The old man ____ before the doctor arrived.
had died died is dying dies

The old man ____ before the doctor arrived.had died died is dying dies
had died 这个老人在医生来之前已经死了.过去完成时

died 小学水平