I FELT THAT IT HAD BEEN A MISTAKE TO WRITE TO HIM.A. I REGRETTED H...

76. I felt that it had been a mistake to write to him.

a. I regretted having written to him.

b. There was a mistake in the letter I wrote to him.

c. I felt like making a mistake to write to him.

d. I made a few mistakes when I wrote to him.