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
考查時態(tài)和主謂一致。population(集合名詞)應(yīng)看成一個整體，謂語動詞用單數(shù)形式；句首的Since then表明謂語動詞應(yīng)用現(xiàn)在完成時態(tài)。自那時起，倫敦的人口每年幾乎增長50 000人，主要是由于移民的涌入。
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