During the last three decades, the number of people participating in physical fitness programs ___ sharplyA.was increasingB.has increasedC.had increasedD.will be increasing
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B解析试题分析：考查动词的时态。句义：在过去的三十年里，参加体育健身项目的人的数量已经急剧的增加了。做对本题要把握关键词During the last three decades，记住：during/in /over/for the last/past +时间段，用于现在完成时，所以B正确。考点：考查动词的时态。