Evdence has been found through years of study children's early sleeping problem likely to continue when they grow up． [ ] A．why B．how C．whether D．that 题目和参考答案——青夏教育精英家教网—

题目内容

Evdence has been found through years of study ________ children's early sleeping problem likely to continue when they grow up．

[　　]

A．why

B．how

C．whether

D．that

答案：D

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