at time i wrote a letter to you asking you to refer the matter to the commission's scientific committee and something for which i'm very grateful to you
At that time, I wrote a letter to you asking you to refer the matter to the Commission's scientific committee, and that is something for which I am very grateful to you.
At time, I wrote a letter to you asking you to refer the matter to the Commission's scientific committee, and something for which I am very grateful to you.