The climate change conference has e 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
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A. 不填， a
B. 不填， the
C. an , a
(答案→)D. an, the
解析：e to an end 固守词组。small step 后有一个定语从句，所以要用the。