we can have ()blue sky if we create () less polluted worldAa,aBa,theCthe ,aDthe,the

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• We can have__bluer sky if we create__less polluted world.A.a;a B.a;the C.the;a D.the;the
• we can have ()blue sky if we create () less polluted world
• we can have ()blue sky if we create () less polluted worldAa,aBa,theCthe ,aDthe,the
• We can have__bluer sky if we create__less polluted world.A.a;a B.a;the C.the;a D.the;the是选D么?为什么
• 1.Leonardo da Vinci（1452—1519） 【 】 birds kept in cages in order to have tje pleasure of setting them free.A.is said to be buying B.is said to have bought2.We can never expect 【 】bluer sky unless we create 【 】 less polluted word.A.a;a B.a;the
• We never expect___bluer sky unless we create __less polluted world.A a,a B a,the C the ,a D the,th
• We can never expect a bluer sky___ we create a less polluted world.答案是unless,为什么不能填until?