问题描述：
名词有形容词来修饰它们,这样就应选不定冠词a或an吗
we can have ___bluer sky if we create_____ less polluted world.
A.a,a B.a,the C.the ,a D.the,the
如果不是的话,那么这道题如何选呢,
we can have ___bluer sky if we create_____ less polluted world.
A.a,a B.a,the C.the ,a D.the,the
如果不是的话,那么这道题如何选呢,
问题解答：
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