During the past 120 years, the world        three waves of global economic integration(聯(lián)合).
A.witnessedB.witnesses
C.has witnessed D.will witness
C

試題分析:考察時(shí)態(tài)。本題的關(guān)鍵在于during the past 120 years是與現(xiàn)在完成時(shí)連用,句意:在過去的120年里,這個(gè)世界已經(jīng)經(jīng)歷了全球經(jīng)濟(jì)聯(lián)合的三次浪潮。故C正確。
點(diǎn)評(píng):時(shí)態(tài)題的考查關(guān)鍵是抓住句子的上下文含義和句中的時(shí)間狀語。要根據(jù)時(shí)間狀語來選擇合適的時(shí)態(tài),在平時(shí)的學(xué)習(xí)中要注意積累有關(guān)時(shí)態(tài)的用法和各種時(shí)態(tài)的特殊之處。如since, so far等經(jīng)常與現(xiàn)在完成時(shí)連用。在條件狀語從句中用一般現(xiàn)在時(shí)代替將來時(shí)等等。
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