B
选B。题干的意思是：“在过去的三十年里，参加健身计划的人数急剧增加。”由时间状语during the last three decades可知，本句要用现在完成时态，所以正确答案为B项。注意对现在完成时态的时间状语in/during/over the last/past ten years，so far，since...等的积累。
(2013·高考浙江卷)During the last three decades，the number of peop
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