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  3. During the last three decades, the number of people participating in physical fitness programs______ sharply.

During the last three decades, the number of people participating in physical fitness programs______ sharply.

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问题 During the last three decades, the number of people participating in physical fitness programs______ sharply.
选项 A、has increased
B、were increasing
C、had increased
D、have increased
答案A
解析 时间状语during the last three decades是现在完成时的标志。另外，“the number of+复数名词或代词”作句子主语时，表示“……的数量”，谓语动词要用单数形式。综合考虑上述因素，选A。
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