Hi, " Although he had arrived in Athens very recently , he has already made friends". This is not correct. The Past Perfect should only be used to indicate that a past event happened before some later time in the past.
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Anonymous"Although he had arrived in Athens very recently, he has already made friends"Personally, I won't consider past perfect to begin with. It's not necessary. First off, there wan't another event preceeding his arriving. Secondly, " he has already made friends " doesn't blend well with the underlined. I would just use