【題目】The population of this city，forty percent of which________，________20% in the last three years.

A．a(chǎn)re Germans；has risen by

B．a(chǎn)re Germans；has fallen to

C．is Germans；have increased to

D．is Germans；have been reduced by

【答案】A

【解析】population作主語時，謂語應(yīng)用單數(shù)，但是有分數(shù)或百分數(shù)說明population時，謂語則用復數(shù)，所以第一個空應(yīng)用復數(shù)，第二個空應(yīng)用單數(shù)。表示增加或減少的幅度用介詞by。

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