During the last three decades the number of people participating in physical fit

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问题 During the last three decades the number of people participating in physical fitness programs ______sharply.

选项 A、were increasing
B、has increased
C、had increased
D、have increased

答案 B

解析本题考查主谓一致和时态。句意：在过去的二三十年里，参加健身项目的人数急剧增加。during the last three decades表示“过去的三十年”，因此用现在完成时，故排除选项A和选项C。the number of…作主语时，后面的谓语动词需要用单数，因此排除选项D。故本题选B。

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