9.____ 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为什么不是其它选项?尤其是D?

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9.____ 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为什么不是其它选项?尤其是D?
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9.____ 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为什么不是其它选项?尤其是D?
9.____ 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
为什么不是其它选项?尤其是D?

9.____ 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为什么不是其它选项?尤其是D?
A可以表示转折的关系
B的意思是“直到……才……”
C的意思是“除非”
D一般表示并列的关系
B、C你都可以轻松的排除
关键是A、D
从句子的含义理解,前一句话和后一句话有转折关系,这两句话不是并列关系
如果场景是这样的:我们已经知道了这个地区的交通存在问题,我们会尽力去解决.就可以用as.
As we know that there are some problems about the traffic in this area,we will try our best to solve them.

请注意后半句 承认归承认 但并不意味..... d不对的 while才对

这句话你能看懂吧
根据句子意思你就应该能判断出来啊 while不是表示对比吗。也可以理解成尽管的意思
在我承认这个地区的交通方面存在问题时,我并没有说这些问题不能解决啊。
你看看 这不是对比是什么

前后表示并列关系,所以可以用while
但是until 和unless 不能表示并列的关系。
as 有两个可能的意思
一是因为,显然意思就不同。
二是虽然,但as 不能放句首,

While作连词讲的时候有尽管的意思,as则没有,这里While作“尽管”讲

whlie和as都有"虽然,尽管"等的意思,引导让步状语从句
但as做虽然,尽管讲的时候,常用倒装语序,模式为:
adj. /adv. / n.+as +主语+谓语+主句。
如: Young as he is, he knows much.
Tired as they were, they walked on.