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the service industry ____ two thirds of the income of this c

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the service industry ____ two thirds of the income of this country.
A.is made of B.makes up of C.makes up D.is made up of
选哪个?WHY?
C 组成 构成 .服务业构成国家收入的三分之二.同样的用法如下
This made up 15%of their total income.
这是他们总收入的百分之十五.
A 由什么制作而成.如 the cake is made of flour. 蛋糕由面粉做成.B 错误,没这个词组.D 由.构成,后面加的是部分. This class is made up of 15 students.