问题补充：
The children in poor areas can’t afford their education. We should think to help them.
A. what can we do
B. what we can do
C. how can we do
D. how we can do
答案：
A. what can we do
(答案→)B. what we can do
C. how can we do
D. how we can do
解析：句意：贫困地区的孩子负担不起他们的学费，我们应该想想我们能够做什么来帮助他们。think后接宾语从句，宾语从句用陈述句的语序，what 作为do 的宾语，而how不能作为do的宾语，故选B
