单选题
During the last three decades, the number of people participating in physical fitness programs ______ sharply.
A、
were increasing
B、
has increased
C、
had increased
D、
have increased
【正确答案】
B
【答案解析】
[解析] 本题考查主谓一致和时态。the number of作主语，表示“…的数量”，谓语动词要用单数。时间状语during the last three decades表示“过去的30年来”，需用现在完成时，故选B。
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