The missing letter had been misfiled.
找不着的那封信放错地方了。
The missing letter was in his pocket, if you please!
丢失的信竟然在他的口袋里，你看怪不怪！
It was just an accident that I found the missing letter.
我找到了那封丢失了的信，完全是偶然的。
I have made a search for the missing letter.
我已查找过那封遗失的信。
I have made a search for the missing letter.
我已查找过那封遗失的信。
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