about后加hundreds of还是three hundred(具体数字)

about后加hundreds of还是three hundred(具体数字) Hundreds 后必须加of吗?那么hundreds years ago hundreds of之前可以加数词吗,比如：three hundreds of 到底是：three hundred of,还是three hundreds of?还是hundreds of 之前就是不能加数词? hundreds of后必须加名词么?可不可以就说hundreds of啊? 英语 hundreds of用法hundreds of people 后用is 还是are hundreds of 后名词用单数还是复式 谓语呢 The bridge is about ___ long添five hundred meters还是five hundreds of meters为什么 two hundred 后要不要加s啊?是two hundred 还是two hundreds? 是about three hundred还是about three hundreds a hundred对还是hundreds of对 是many hundred of 还是many hundreds many hundreds of 还是many hundred many hundred还是many hundreds of There are about ____ students in our schoolA five hundred Bfive hundreds Cfive hundreds of hundreds of thousand 还是 hundreds of thousand哪个是正确的?弄错了，第二个是hundreds of thousands 按照提示填空 并说明单词特性 还有hundreds of boy 还是hundreds of boys 2 hundred of students 还是 2 hundreds of studentsrt two hundreds of students还是two hundred of students