During the last three decades, the number of people participating in physical fitness programs sharply. A.was increasing B.has increased C.had increased D.will be increasing
答案:【解析】选B。考查时态。句意:近30年来,参加健身活动的人数一直在急剧增加。during the last three decades近30年来,这是包括现在时间在内的时间段,是现在完成时的时间标志,故选B。