答案：C
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
()企业与供应商之间的关系大致可以分为五种,其中渗透型是在长期目标型集成上发展起来的,联盟型是从供应链角度提出的。
A．正确
B．错误
