He thanked me for what I ---.
Is it have done or had done
If you did it relatively recently and it is still of present relevance, "have done" is preferable. Otherwise, 'had done' is fine. what I did'.
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If you did it relatively recently and it is still of present relevance, "have done" is preferable.
Otherwise, 'had done' is fine.
You could also say '...what I did'.