加急The population of the city,twenty percent of which( ),( )10% in the last three years.A are Japanese,has risen byB are Germans,has fallen byC is German,have increased toD is Japanese,Have been reduced by为何不能选B

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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

A.
twenty percent of which ( ),括号中的be动词应为are,"Germans"这个单词是错误的,所以选A.

A 前面一个主要是具体指人,而后面的主语明显是population 所以用单数

选A和B

A 前面一个主要是具体指人,而后面的主语明显是population 所以用单数.我觉得fallen 后应该是to