During the last three decades, the number of people participating in physical fitness prog

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

A. was increasing(答案→)B. has increasedC. had increasedD. will be increasing解析：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。

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