The climate change conference has come to end but the developing countries are dissatisf

问题补充：

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：

A. 不填， a

B. 不填， the

C. an , a

(答案→)D. an, the

解析：come to an end 固守词组。small step 后有一个定语从句，所以要用the。