【单选题】
The problem, according to the experts, is （） we should do with the salty land.
The problem, according to the experts, is （） we should do with the salty land.
A、 what
B、 whether
C、 how
D、 that
题目答案
答案解析
略
略
A、 what
B、 whether
C、 how
D、 that