问题补充:
Some children don’t know for their parents.
A. what can they care
B. how can they care
C. what to care
D. how to care
答案:
A. what can they care
B. how can they care
C. what to care
(答案→)D. how to care
解析:句意:一些孩子不知怎样关心他们的父母。宾语从句用陈述句语序,故排除AC。怎样照顾父母,故选D。