When the dolpin ( ) by sea ,it had been killeddiscovered 和 was discovered 哪个对?为什么?

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When the dolpin ( ) by sea ,it had been killeddiscovered 和 was discovered 哪个对?为什么?
When the dolpin ( ) by sea ,it had been killed
discovered 和 was discovered 哪个对?为什么?

When the dolpin ( ) by sea ,it had been killeddiscovered 和 was discovered 哪个对?为什么?
was discovered

discovered对
如果是后者 需要 that

was discovered对,表被动