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    7．Since the financial crisis occurred in 2008，the unemployment of the United States _____ at the level of around 9percent．（　　）
    A．has beenB．isC．had beenD．was

    分析 自从2008年发生的金融危机以来，美国的失业率一直维持在大约9%的水平．

    解答 答案：A．
    根据时间状语Since the financial crisis occurred in 2008可知，该句应该使用现在完成时，强调金融危机对美国的经济所造成的影响，所以用现在完成时；故选A．

    点评 本题考查现在完成时的用法，要格外留心一些典型的时间状语对于做题是很有帮助的，over the past decade，so far，since 1996等．

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