We can never expect bluer sky unless we create less polluted world. A. a; aB. a; the C. th

发布时间：2020-08-16 08:40:51

We can never expect    bluer sky unless we create     less polluted world.  
A. a; a
B. a; the
C. the; a
D. the; the

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(答案→)A. a; a
B. a; the
C. the; a
D. the; the
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