She said she has already sent the letter to us.哪错了

She said she has already sent the letter to us.哪错了
She said she has already sent the letter to us.哪错了

She said she has already sent the letter to us.哪错了
She said she had already sent the letter to us.

has改had

"has"错了
前面出现了“said”那么“sent the letter to us”就是过去的过去 用过去完成时

She said she had already sent the letter to us.(sent the letter)这个动作发生在（She said）之前，所以应使用过去完成时。