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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
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。
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