A third of parents have said they are unsure whether the education standards hace been adopted ___th

A third of parents have said they are unsure whether the education standards hace been adopted ___th

题目
A third of parents have said they are unsure whether the education standards hace been adopted ___they live.
A why B when C where D until
the answer is C the answer is C,translate it ,thanks
答案
三分之一的家长说过他们不确定在他们所生活的地方是否采用了教育标准
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