问题补充：
children get older, they become more and more interested in everything.
A. Once
B. Whether
C. With
D. As
答案：
A. Once
B. Whether
C. With
(答案→)D. As
解析：考查连词：A. Once一旦，B. Whether不管，是否，C. With随着，这是介词，D. As连词“随着”，句意：随着孩子年龄的增长，他们对一切越来越感兴趣了。因为with是介词，不能接从句，选D。
