为什么有的 a hundred of 加S a hundreds of 有的不加 还有 thousands 也是

为什么有的 a hundred of 加S a hundreds of 有的不加 还有 thousands 也是 We learned two ___new words last term.A.hundreds B.hundreds of C.hundred D.hundred of为什么选c?不是说复数要加s的吗? 为什么 two hundred hundred不用加s? of后为什么要加限定,比如hundred of the student,of mine Less than ( ) lived there two ( ) ago.A,hundreds of people,hundred years.B .hundreds of people ,hundreds year.选择哪个啊?为什么?（另hundred 不是不加S ） Jack will donate a hundred of his books to help the poor children 为什么用a hundred of out of a hundred是什么意思? our holiday is coming.two------the students will go.A hundred B hundred of C hundred s of D hundreds 选什么?为什么 Two_____ the students in our school will go to the beach.该填哪个.A.hundred B.hundred of什么时候加of 什么时候不加, How many teachers are there in your school?A：Hundreds B:Hundred C:Hundred of D:One Hundred我在百度上搜了这道题,有的人选A ,有的人选D之类的, a hundred和a hundred of的区别 ___these books were offered to the Project HopeA.two hundred B.two hundred of为什么用B不用A a hundred students为什么中间不用of?a kg of meat却要? a kg of apples和 a hundred studentS为什么一个有OF,一个没有 hundreds of与hundred of的区别,加s的hundred与不加s的hundred有什么区别 (one)tenth of (a)thousand is(a)hundred为什么用（one,a,a,） 为什么hundred不可以加s there are _readers in the library A hundred of B three hundreds C hundreds of D three hundred of说明为什么