International situation is currently undergoing great changes UNESCO plays an irreplaceable role in promoting international cooperation.
A. which
B. what
C. where
D. that
网友回答
A. which
B. what
(答案→)C. where
D. that
解析：句意：国际形势正在经历着巨大的变化,其中联合国教科文组织在促进国际合作中发挥着不可替代的重要作用。这句话使用了定语从句，先行词是International situation，定语从句中不缺少主宾表，缺少的是地点状语，所以用where引导定语从句。选C。