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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 自從2008年發(fā)生的金融危機以來，美國的失業(yè)率一直維持在大約9%的水平．

解答 答案：A．
根據時間狀語Since the financial crisis occurred in 2008可知，該句應該使用現在完成時，強調金融危機對美國的經濟所造成的影響，所以用現在完成時；故選A．

點評 本題考查現在完成時的用法，要格外留心一些典型的時間狀語對于做題是很有幫助的，over the past decade，so far，since 1996等．

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