问题补充:
We can have blue sky if we create less polluted world.
A. a. a
B. a, the
C. the, a
D. the, the
答案:
(答案→)A. a. a
B. a, the
C. the, a
D. the, the
解析:此题重点考查不定冠词的用法,表示泛指。
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