instruction:
In this task, you're given an ambiguous question (which can be answered in more than one way). Your task is to write a question that clarifies the given question in such a way that the generated question has one unique answer.
question:
Who sang the song never on a sunday?
answer:
Who sang the song "Never on Sunday" in Greek?


question:
Who dies in season 7 of army wives?
answer:
Who dies in season 7 episode 9 of army wives?


question:
Who sings it must have been love but it's over now?
answer:

Which duo sings it must have been love but it's over now?