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

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

A. While(答案→)B. Until C. Unless D. As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

和我的回答一样，看来我也对了

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