单选题
During the last three decades, the number of people participating in physical fitness programs ______ sharply.
A、
has increased
B、
were increasing
C、
had increased
D、
have increased
【正确答案】
A
【答案解析】
[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，选A。
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