Evidence has been found through years of study______children’s early sleeping problems are likely to
continue when they grow up.
A．whyB．howC．whetherD．that
D

試題分析：考查同位語(yǔ)從句：句意：通過(guò)多年的研究已經(jīng)發(fā)現(xiàn)了證據(jù)，孩子們?cè)缙诘乃邌?wèn)題可能隨著長(zhǎng)大會(huì)繼續(xù)。通過(guò)分析句子結(jié)構(gòu)，可知這個(gè)句子中包含一個(gè)同位語(yǔ)從句，說(shuō)明evidence的內(nèi)容，用that連接同位語(yǔ)從句，that在同位語(yǔ)從句中不作任何成分，且沒(méi)有實(shí)際意義，選D。
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