5.（ ）the city's public school system should be open to the c

5.（ ）the city's public school system should be open to the children of migrant workers has become the focus of discussion.A That B What C Whether D If
我选A 我觉得没有or not应该就是主语从句了吧 没有疑问在里面不是吗?
6.（ ）difficult explorations are,humans have never stopped moving forward.
A While B Despite C As D However 我选B