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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

高三英语单项填空中等难度题

少年,再来一题如何?
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