问题
选择题
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
答案：B
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。