问题
选择题
Evidence 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
答案：D
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Evidence 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