题文
________ global temperatures rising, the UN Climate Change Conference was held in Cancun（坎昆）, Mexico last year．
| A．Prevented | B．Preventing |
| C．Having prevented | D．To prevent |
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________ global temperatures rising, the UN Climate Change Conference was held in Cancun（坎昆）, Mexico last year．
| A．Prevented | B．Preventing |
| C．Having prevented | D．To prevent |
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