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    精英家教网 > 高中英语 > 题目详情
    Evidence has been found through years of study _____ children’s early sleeping problems are likely to continue when they grow up.
    A．whyB．howC．thatD．whether
    C

    试题分析：通过分析句子结构，可知这个句子中包含一个同位语从句，且引导词在同位语从句中不作任何成分，且没有实际意义，故用that。
    点评：在复合句中充当同位语的名词性从句称为同位语从句。解答这类题，首先要确定从句是什么从句，然后依据相应的语法规则答题。同位语从句中引导词的确定，要看它在同位语语从句中作什么成分，有没有什么实际意义。
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