I admit that there are still some problems about the traffic in this area, I don
来源：网络
时间：
推荐文章
_______ I admit that there are still some problems about the traffic in this area, I don't mean that it can't be solved.
A. While B. Until C. Unless D. As
试题答案
B
解析:
注意到主句中的I don't mean….，就不难选出until引导的时间状语从句，表示"直到……才"