【题目】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】B
【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。