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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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