Over the last three decades

【题目】Over 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】

考查时态。句意：在过去的三十年里，参加健身计划的人数急剧增加。Over the last three decades“在最近的30年里”和现在完成时态连用，故选B。