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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1719

Evidence has been found through years of study______ children’s early sleeping problem likely to continue when they grow up.

A.why B.how C.whether D.that
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Evidencehasbeenfoundthroughyea