About of the workers in that steel factory young people.A. third-fifths ; areB. three-fif

问题补充：

About of the workers in that steel factory young people.

A. third-fifths ; are

B. three-fifths ; are

C. three-fives ; is

D. three-fifth ; is

答案：

A. third-fifths ; are

(答案→)B. three-fifths ; are

C. three-fives ; is

D. three-fifth ; is

解析：考查分数百分数和主谓一致。当分子大于等于二的时候，分母的序数词使用复数形式。当分数百分数后面的名称是可数名词复数的时候，谓语部分使用复数形式。句意：钢铁厂中大约五分之三的工人都是年轻人。故B正确。