The plural can simply express a general or indefinite sense, as in Sophocles, Oedipus Rex 1184f.
ὅστις πέφασμαι ... ξὺν οἶς / τ' οὐ χρῆν ὁμιλῶν, οὕς τέ μ' οὐκ ἔδει κτανών. "[ I], who am revealed to have had intercourse with whom I shouldn't have and killed whom I shouldn't have."
(where Oedipus is referring to only one person respectively, first his mother, then his father). So "Who did you kill?" would be just fine here as well, I think.
« Last Edit: 07 Oct, 2010, 12:14:42 by Antigone »
καλῶς δρῶν ἐξαμαρτεῖν μᾶλλον ἢ νικᾶν κακῶς.