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    精英家教网 > 高中英语 > 题目详情
    Some amazing people _______ our world for the better in the past 100 years.
    A．changeB．are changingC．have changedD．had changed
    C

    试题分析：表示过去的某一动作或行为一直持续到现在，用现在完成时，故选C。
    点评：英语中的时态主要由动词的形式决定，因此在学习英语时态时，要注意分析动词形式及具体语境，想象在那个特定的时间动作所发生的背景，这个动作是经常性动作、一般性动作、进行性动作、完成性动作还是将要发生的动作。
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