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    16．Beijing isn't what it used to be．The last decade        great changes in the city images．（　　）
    A．witnessedB．was witnessedC．has witnessedD．had witnessed

    分析 北京不再是过去的样子了，过去十年已经见证了该市形象的巨大变化．

    解答 答案：C．根据主语"The last decade"可知"过去十年已经见证了该市形象的巨大变化"所以谓语动词用现在完成时，表示从过去开始一直到现在的动作．因此答案是C．

    点评 本题考查现在完成时．
    现在完成时表示过去发生的动作对现在造成的影响或结果或表示过去的动作或状态持续到现在．它的构成是：主语+have/has+动词的过去分词．

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