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【题目】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】

考查强调句型。句意:通过多年的研究,科学家们发现了社交媒体成瘾和抑郁症之间的关系。此处是强调句型,故答案为C

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