问题
选择题
________ 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
答案
答案：D
考查不定时做目的状语。 为了防止全球气温增长，去年联合国在墨西哥坎昆召开了气候大会。