组卷网 > 初中英语综合库 > 语法 > 冠词 > 不定冠词 > a/an的区别
题型:单项选择 难度:0.94 引用次数:90 题号:15691028
We can have ________ blue sky if we create ________ less polluted world.
A.a; theB.a; aC.the; aD.the; the

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