Question

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

Answer 1

A

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。