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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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