two-thirds of a cake 后的谓语动词是单数还是复数?

单数。分数,百分之。 后面的谓语动词用单数还是复数,由其后的名词决定。75% of the students here are from China。 (students是复数名词,故用复数动词are)Three quaters of the land is polluted。 (land是不可数,故用单数动词is)