Half of the workers here are under twenty __B__ A.years old B.years of age 为什么选B

Half of the workers here are under twenty __B__ A.years old B.years of age 为什么选B the role of migrant workers half of the 英语类 英数题A team is going to buiid a road.54 workers covered1944 meters in 12 days. lf 18 workers are added, and the time is reduced to a half of before. how long can they build?(suanshi) The workers also cleaned all of them. the other half of me the half of my life Half of the apples ____good. half the class 与half of the class的区别 half the sky half of the sky区别 half the books还是half of the books? The dream of you AND half of one fourth of workers还是one fourth of the workers哪个对,为什么 Half of the workers here _____ under 30 _____.　A.is/years B.are/year oldHalf of the workers here _____ under 30 _____.　A.is/years B.are/year old　C.is/years old D.are/years of age为什么是D Half of the time to pursue the half students和half of the students有什么区别 The population of the workers ___200.is 还是are. Many of the workers were at the meeting.