we can have ___bluer sky if we create_____ less polluted world.A.a,a B.a,the C.the ,a D.the,the为什么不选the,sky和world都只一个表特指啊?

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wecanhave___bluerskyifwecreate_____lesspollutedworld.A.a,aB.a,theC.the,aD.the,the为什么不选the,sky和world都

we can have ___bluer sky if we create_____ less polluted world.A.a,a B.a,the C.the ,a D.the,the为什么不选the,sky和world都只一个表特指啊?
we can have ___bluer sky if we create_____ less polluted world.A.a,a B.a,the C.the ,a D.the,the
为什么不选the,sky和world都只一个表特指啊?

we can have ___bluer sky if we create_____ less polluted world.A.a,a B.a,the C.the ,a D.the,the为什么不选the,sky和world都只一个表特指啊?
因为这些名词前都有形容词来修饰它们,这样就应选不定冠词a或an

A.a,a