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I would like to thank whoever it was that wrote that piece of music: it has given me so much pleasure.
A. I would like to thank whoever it was that wrote that piece of music:
B. I would like to thank whomever it was that has written that piece of music:
C. I would like to thank whomever it might be that wrote that piece of music:
D. Whoever it was that wrote that piece of music, I would like to thank because
E. I would like to thank whoever it was that wrote that piece of music
E (Pronoun subject, object)