◎ 题干
The climate change conference has come to __________ end, but the developing countries are
dissatisfied with __________ small step that the developed countries have taken to reduce the
emission (排放) of water gases.
[     ]
A. 不填, a          
B. 不填, the      
C. an ,  a          
D. an, the
◎ 答案
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◎ 解析
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◎ 知识点
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