
Sorry I didn't reply. と Sorry I haven't replied. とどちらがいいでしょうか。

tommy_san,
I would more likely say "didn't", too.
Compare with this:
I got an email from Tom yesterday, but I haven't yet replied.
https://tatoeba.org/eng/sentences/show/4515081
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This sentence was initially added as a translation of sentence #4478311
added by BahDuring, September 11, 2015
linked by BahDuring, September 11, 2015
linked by deyta, December 10, 2015