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    精英家教网 > 高中英语 > 题目详情
    During the past 120 years, the world        three waves of global economic integration（联合）.
    A．witnessedB．witnesses
    C．has witnessed D．will witness
    C

    试题分析：考察时态。本题的关键在于during the past 120 years是与现在完成时连用，句意：在过去的120年里，这个世界已经经历了全球经济联合的三次浪潮。故C正确。
    点评：时态题的考查关键是抓住句子的上下文含义和句中的时间状语。要根据时间状语来选择合适的时态，在平时的学习中要注意积累有关时态的用法和各种时态的特殊之处。如since， so far等经常与现在完成时连用。在条件状语从句中用一般现在时代替将来时等等。
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