◎ 题干
We can never expect _____ bluer sky unless we create _____ less polluted world.
  [     ]
A. a; a
B. a; the
C. the; a
D. the; the
◎ 答案
查看答案
◎ 解析
查看解析
◎ 知识点
    根据n多题专家分析,试题“We can never expect _____bluer sky unless we create_____less polluted world. [ ] A. a; a B. a; theC. the; a D. the; the …”主要考查了你对  【不定冠词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。