We can never expect a bluer sky___ we create a less polluted world.答案是unless,为什么不能填until?

we can never we can never expect a bluer sky unless we create a less polluted world.2009 安徽高考 We can never expect a bluer sky___ we create a less polluted world.答案是unless,为什么不能填until? We can never expect ___ bluer sky unless we create ___ less polluted world.A.a; a B.a; theC.the; a D.the; the请问答案是什么? 谁能帮我解释一下句子中的两个冠词要用a?We can never expect a bluer sky unless we create a less polluted world We can never have yesterday. never expect,only hope We shall never have friends if we expect to find them without fault. We shall never have friends if we expect to find them without fault 28. We can never expect ______ bluer sky unless we create _____ less polluted world. （安徽）A. a; a B. a; the C. the; a D. the; the 请详细分析,越详细越好.谢谢! we can never expect a bule sky unless we create a less polluted world不是限制性词语忙,为什么不用the ,不会是因为world是虚拟的事物 Can we never end this moment? Can we never say goodbye?神马意思? Can we will never say goodbye? So can never expect yourself get your love more than her什么意思 how can you expect to learn everything__you never listenin caseeven if unlessthougheverything改为anything How can you expect to learn anything when you never listen翻译汉语 好天气即将来临,我们期待出外郊外.Good___ ____ _____,we can expect an outing.Good___ ____ _____,we can expect an outing.应该则么写错了,应该是Good weather is ____ ____ _____,we can expect an outing We can—a lot from them.A.expects B.expect to C.eWe can—a lot from them.A.expectsB.expect toC.expect to learnD.expect learn