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 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,故选A。
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