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only one third ___ in the school ___been repaired.

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only one third ___ in the school ___been repaired.
A.of the desks,has B.desks,have
C.of the desks,have D.desks,has
为什么选C?
不能说one third desks吗?
only one third ___ in the school ___been repaired.
C
one third是三分之一,分数词后面跟出的名词是可数名词,用其复数形式
如:two thirds of the books
又因为desk是可数名词,用复数的形式,所以用have而不是has
如果名词是不可数名词,用has
如:Only one third of the homework has been done
就该用has,因为homework不可数