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(jī)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(jù)時(shí)間狀語Since the financial crisis occurred in 2008可知，該句應(yīng)該使用現(xiàn)在完成時(shí)，強(qiáng)調(diào)金融危機(jī)對(duì)美國的經(jīng)濟(jì)所造成的影響，所以用現(xiàn)在完成時(shí)；故選A．

點(diǎn)評(píng) 本題考查現(xiàn)在完成時(shí)的用法，要格外留心一些典型的時(shí)間狀語對(duì)于做題是很有幫助的，over the past decade，so far，since 1996等．

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