Did a survey 是for 、about还是of

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Did a survey 是for 、about还是of

Did a survey 是for 、about还是of
Did a survey 是for 、about还是of

Did a survey 是for 、about还是of
for目的.I did a survey for investigating citizen's health condition.
about相关方面. I did a survey about students' favorite sports.
of 关于什么的调查. I did a survey of water pollution.