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Evidence has been found through years of study______children’s early sleeping problems are likely to continue when they grow up. 

A．why B．how C．whether D．that

D

解析試題分析：考查同位語從句：句意：通過多年的研究已經(jīng)發(fā)現(xiàn)了證據(jù)，孩子們早期的睡眠問題可能隨著長大會繼續(xù)。通過分析句子結(jié)構(gòu)，可知這個句子中包含一個同位語從句，說明evidence的內(nèi)容，用that連接同位語從句，that在同位語從句中不作任何成分，且沒有實際意義，選D。
考點：同位語從句的考查

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