International situation is currently undergoing great changes ________ UNESCO plays an irreplaceable role in promoting international cooperation.

A．which B．what C．where D．that

C

解析試題分析：句意：國際形勢正在經(jīng)歷著巨大的變化,其中聯(lián)合國教科文組織在促進(jìn)國際合作中發(fā)揮著不可替代的重要作用。這句話使用了定語從句，先行詞是International situation，定語從句中不缺少主賓表，缺少的是地點(diǎn)狀語，所以用where引導(dǎo)定語從句。選C。
考點(diǎn)：考查定語從句

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