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
网友回答
A. was increasing
(答案→)B. has increased
C. had increased
D. will be increasing
解析：句意：在过去的三十年里，参与身体锻炼的人的数量激增。根据时间状语判断应用现在完成时，故选Ｂ。
【考点定位】时态用法辨析。时态的选择主要看具体句式和时间状语，本题根据时间状语很容易进行判断。