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加急The population of the city,twenty percent of which( ),( )1

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加急
The population of the city,twenty percent of which( ),( )10% in the last three years.
A are Japanese,has risen by
B are Germans,has fallen by
C is German,have increased to
D is Japanese,Have been reduced by
为何不能选B
A
第一个之所以用are,twenty percent of the population 表示的是20%的人,用复数
第二个,主语为The population,population此时作为人口来讲,是不可数名词,所以用has risen by