When I found the letter ,someone ____(open) it already.用适当的形式填空…… 并为什么要填这个答案 为什么不是 has opened

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When I found the letter ,someone ____(open) it already.用适当的形式填空…… 并为什么要填这个答案 为什么不是 has opened
When I found the letter ,someone ____(open) it already.
用适当的形式填空……
并为什么要填这个答案
为什么不是 has opened

When I found the letter ,someone ____(open) it already.用适当的形式填空…… 并为什么要填这个答案 为什么不是 has opened
had opened
我发现的时候是过去时态,信被开启在我发现之前,所以用过去完成时
has opened 是现在完成时,如果前面用find,那就用has opened

opened 过去式

had opened
在我发现信之前,已经有人开过它了.
必须用完成时态

had opened翻译为 当我发现这信时，已有人打开它了。用过去完成时。

had opened
在发现之前，就已经打开了，再根据时态，得出 过去完成时。

had open, 过去完成式。
因为前面用的是find的过去式found，而found的内容发生在found以前，是在过去发生的事“found it”以前就已经发生并且完成了的“had opened already”，所以要用过去完成式。

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