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高考英语单选一道关于定语从句与表语从句?

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高考英语单选一道关于定语从句与表语从句?
Evidence has been found through years of study___ children's early sleeping problems are likely to continue when they grow up.
A why
B that
我知道选B
1)如果选用why,why及空后的句子看成一个定语从句修饰evidence为什么不可以?
2)同位语从句是不是只是用来解释说明内容的
why定语从句的先行词必需是reason.
如 the reason why he didn't attend the meeting is that he was ill.
这个同位语从句是来解释说明前面名词evidence的内容的.