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The population of this city,forty percent of which ___,___15

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The population of this city,forty percent of which ___,___15%in the last three years.
A are Germans;has risen
B are German;has fallen by
C is Germans;have increased to
D is Germans;has been reduced by
我记得German的复数是Germans,但这么看的话好象就一个都不对了,
B
首先这里的population表示集合概念,虽然是单数形式,但表示的是复数的含义,所以C、D删去~分辨A、B的时候主要看B有个by,能和后面的15%连接,所以综上选B了~