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
网友回答
D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。