21. The population of Jiangsu __ to more than twice what it was in 1949. The figure is now approaching 74 million.
A. has grown B. have grown C. grew D. are growing
【答案】A
【解析】考察主谓一致和时态。population是集合名词，或集体名词，即看成一个整体，所以谓语动词用单数形式。句子说的是江苏现在的人口数量和以及增长，用完成时表示现在的状态。
