Since then the population of London by almost 50,000 a year—an increase largely fuelled by immigration.
A. has risen
B. have risen
C. rises
D. rise
网友回答
(答案→)A. has risen
B. have risen
C. rises
D. rise
解析:考查时态和主谓一致。population(集合名词)应看成一个整体,谓语动词用单数形式;句首的Since then表明谓语动词应用现在完成时态。自那时起,伦敦的人口每年几乎增长50 000人,主要是由于移民的涌入。