i had never seen before. 为什么不用saw？

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第1个回答 2015-06-20

had done 是过去完成时，接动词要接过去分词形式，saw是see的过去式，seen是see的过去分词形式

第2个回答 2015-06-20

完成时用过去分词形式seen
saw只是过去式，用于一般过去时。

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第3个回答 2015-06-20

因为这里应该是过去分词，而不是过去式

第4个回答 2015-06-20

因为是过去完成时

第5个回答 2015-06-20

应该是过去分词，而不是过去式

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