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    (2014·东北三省三校一联)Traffic conditions in Beijing________for decades.At first people only complained about jams during rush hours，but today every hour is rush hour.
    A．is worsening　B．have worsened
    C．have been worsening　D．worsened
    C
    考查动词的时态。由空后的for decades可推知，此处要用完成时态，故可以排除A、D两项。由下句内容可知，北京这种交通状况是从过去一直持续到现在，且会持续下去，故应该用进行时态。
    答案：　C
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