By the time the doctor arrived ,the man _ already.A.died B.has died C.had died D.dies

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By the time the doctor arrived ,the man _ already.A.died B.has died C.had died D.dies
By the time the doctor arrived ,the man _ already.A.died B.has died C.had died D.dies

By the time the doctor arrived ,the man _ already.A.died B.has died C.had died D.dies
C
by跟过去时间用过去完成时

C.过去完成时

C.had died
by the time后面要用过去完成时。
过去完成时，表示过去的过去

选C ，句子中有明显的时间的对比，男子死亡是发生在医生来之前，即arrived 之前，过去的过去，用过去完成时

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