Evidence has been found through years of study________ children's early sleeping problems areli

题目简介

Evidence has been found through years of study________ children's early sleeping problems areli

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. why                            
B. how      
C. whether                        
D. that
题型:单选题难度:中档来源:专项题

答案

D

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