________ global temperatures rising, the UN Climate Change Conference was held in Cancun（坎昆）, Mexico last year．
A．PreventedB．Preventing
C．Having preventedD．To prevent
D
考查不定時(shí)做目的狀語(yǔ)。 為了防止全球氣溫增長(zhǎng)，去年聯(lián)合國(guó)在墨西哥坎昆召開(kāi)了氣候大會(huì)。
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