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  3. During the last three decades, the number of people participating in physical fitness programs_________sharply. A number of them

During the last three decades, the number of people participating in physical fitness programs_________sharply. A number of them

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问题 During the last three decades, the number of people participating in physical fitness programs_________sharply. A number of them_________to lose weight.
选项 A、has increased; exercise
B、were increasing; exercise
C、had increased; exercises
D、have increased; exercises
答案A
解析 during the last three decades(在过去的30年里)是现在完成时的标志，所以第一句话应用现在完成时。另外，“a number of+名词或代调”作主语时，后面的谓语动词用复数形式；而“the number of +名词或代词”作主语时，后面的谓语动词用单数形式。故选A。
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