Evidence has been found through years of study that children’s early sleeping problems are

问题补充：

Evidence has been found through years of study that children’s early sleeping problems are to continue when they grow up.

A. likely

B. possible

C. probable

D. narrowly

答案：

(答案→)A. likely

B. possible

C. probable

D. narrowly

解析：句意：经过多年的研究证据表明孩子们早期的睡眠问题很有可能当他们长大后仍会继续存在。sb/sth be likely to do sth某人或物很可能做某事，固定结构，故选A.