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
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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。

I found the way to let you it什么歌啊 翻译I found the way to let you leave. i found the way to let you it i found the way to let you it怎么翻译 i found the lights (开着)when i came back When I returned home,i found the purse was lost when I got there,I found the farm tools_____.(repair) The ambiguity let me lose myself,when I found that cannot without him,but he said all over请帮我翻译成汉语 Daniel_(hide)behind the tree when I found him yesterday. The cat was______(die),when I found it. When I went home,I found a package inWhen I went home,I found a package in the mailbox When I was packing for university,I found it extremely difficult to let go of some of the things I求此句中pack for的解释用法 i found the way to let you it,i never really had it coming是什么歌? I found the way to let you it I never really had it coming 的意思 I found the door open when I got home为什么不是opening?或动词不定式I found the door to be open when I got home 那I found the door to be open when I got home等不等于I found the door open when I got home 英语翻译When I ------- -------,I found I ------ ----- ------ ------ ---- ------- 有这一句歌词的歌是哪首i found the way to let you it mp3