On Dec．1, 2006, after years of planning and billions of dollars in investment, the 15th Asian Games officially opened in the Qatari capital Doha(卡塔尔首都多哈)with more than 13 000 athletes from 39 countries and regions ________ for gold in 45 events．A.petingB.petedC.to be petingD.to be peted
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A