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(2014·東北三省三校一聯(lián))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
考查動詞的時態(tài)。由空后的for decades可推知，此處要用完成時態(tài)，故可以排除A、D兩項。由下句內容可知，北京這種交通狀況是從過去一直持續(xù)到現(xiàn)在，且會持續(xù)下去，故應該用進行時態(tài)。
答案：　C
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