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【題目】It is through years of research ________ scientists have discovered the relationship between social media addiction and depression.

A. sinceB. beforeC. thatD. when

【答案】C

【解析】

考查強調句型。句意:通過多年的研究,科學家們發(fā)現了社交媒體成癮和抑郁癥之間的關系。此處是強調句型,故答案為C。

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