In Copenhagen Climate Conference, rich countries promised to _________ a fund of ＄100 billion a year by 2020 to help developing countries．A.make upB.put upC.set upD.send up
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C解析句意：哥本哈根气候会议上，富裕国家许诺到2020年每年设立1000亿美元的基金以帮助发展中国家。set up建立，设立；make up编造；put up搭建；send up发射。