I admit that there are still some problems about the traffic in this area I don't mean t

问题补充：

I admit that there are still some problems about the traffic in this area, I don mean that it can be solved.

A. While

B. Until

C. Unless

D. As

答案：

A. While

(答案→)B. Until

C. Unless

D. As

解析：注意到主句中的I don mean….，就不难选出until引导的时间状语从句，表示直到……才