from what study did they know this result?

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from what study did they know this result?
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from what study did they know this result?
from what study did they know this result?

from what study did they know this result?
study 在此是名词,应理解为 “研究、实验、调查”的意思

整句话:他们是从哪份研究报告中得出这个结果?