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。考查动词时态。根据句首的during the last three decades这个时间状语，可以判断出后面句子应该用 现在完成时态。 【句意】过去三十年来，参加体育锻炼的人数增长了。

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