I have a question would it be better to say What legal systems is civil law based upon? What legal systems are civil law based upon? or What legal systems are civil laws based upon?
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What legal system is civil law based upon? What legal systems are civil laws based upon?
— Mister Micawber
What legal system is civil law based upon?
What legal systems are civil laws based upon?
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The whole thing depends upon how many systems there are and how many civil laws there are. I have given you the most uncontestedly grammatical versions.